PhpRedis

The phpredis extension provides an API for communicating with the Redis key-value store. It is released under the PHP License, version 3.01. This code has been developed and maintained by Owlient from November 2009 to March 2011.

You can send comments, patches, questions here on github, to [email protected] (@yowgi), to [email protected] (@grumi78) or to [email protected] (@yatsukhnenko).

Supporting the project

PhpRedis will always be free and open source software, but if you or your company has found it useful please consider supporting the project. Developing a large, complex, and performant library like PhpRedis takes a great deal of time and effort, and support would be appreciated! ❤️

The best way to support the project is through GitHub sponsors. Many of the reward tiers grant access to our slack channel where myself and Pavlo are regularly available to answer questions. Additionally this will allow you to provide feedback on which fixes and new features to prioritize.

You can also make a one-time contribution with one of the links below.

Sponsors

Table of contents

1. Installing/Configuring
   • Installation
   • PHP Session handler
   • Distributed Redis Array
   • Redis Cluster support
   • Redis Sentinel support
   • Running the unit tests
2. Classes and methods
   • Usage
   • Connection
   • Retry and backoff
   • Server
   • Keys and strings
   • Hashes
   • Lists
   • Sets
   • Sorted sets
   • HyperLogLogs
   • Geocoding
   • Streams
   • Pub/sub
   • Transactions
   • Scripting
   • Introspection

Installing/Configuring

Installation

For everything you should need to install PhpRedis on your system, see the INSTALL.markdown page.

PHP Session handler

phpredis can be used to store PHP sessions. To do this, configure session.save_handler and session.save_path in your php.ini to tell phpredis where to store the sessions:

session.save_handler = redis
session.save_path = "tcp://host1:6379?weight=1, tcp://host2:6379?weight=2&timeout=2.5, tcp://host3:6379?weight=2&read_timeout=2.5"

session.save_path can have a simple host:port format too, but you need to provide the tcp:// scheme if you want to use the parameters. The following parameters are available:

• weight (integer): the weight of a host is used in comparison with the others in order to customize the session distribution on several hosts. If host A has twice the weight of host B, it will get twice the amount of sessions. In the example, host1 stores 20% of all the sessions (1/(1+2+2)) while host2 and host3 each store 40% (2/(1+2+2)). The target host is determined once and for all at the start of the session, and doesn't change. The default weight is 1.
• timeout (float): the connection timeout to a redis host, expressed in seconds. If the host is unreachable in that amount of time, the session storage will be unavailable for the client. The default timeout is very high (86400 seconds).
• persistent (integer, should be 1 or 0): defines if a persistent connection should be used. (experimental setting)
• prefix (string, defaults to "PHPREDIS_SESSION:"): used as a prefix to the Redis key in which the session is stored. The key is composed of the prefix followed by the session ID.
• auth (string, or an array with one or two elements): used to authenticate with the server prior to sending commands.
• database (integer): selects a different database.

Sessions have a lifetime expressed in seconds and stored in the INI variable "session.gc_maxlifetime". You can change it with ini_set(). The session handler requires a version of Redis supporting EX and NX options of SET command (at least 2.6.12). phpredis can also connect to a unix domain socket: session.save_path = "unix:///var/run/redis/redis.sock?persistent=1&weight=1&database=0".

Session locking

Support: Locking feature is currently only supported for Redis setup with single master instance (e.g. classic master/slave Sentinel environment). So locking may not work properly in RedisArray or RedisCluster environments.

Following INI variables can be used to configure session locking:

; Should the locking be enabled? Defaults to: 0.
redis.session.locking_enabled = 1
; How long should the lock live (in seconds)? Defaults to: value of max_execution_time.
redis.session.lock_expire = 60
; How long to wait between attempts to acquire lock, in microseconds (µs)?. Defaults to: 20000
redis.session.lock_wait_time = 50000
; Maximum number of times to retry (-1 means infinite). Defaults to: 100
redis.session.lock_retries = 2000

Distributed Redis Array

See dedicated page.

Redis Cluster support

See dedicated page.

Redis Sentinel support

See dedicated page.

Running the unit tests

phpredis uses a small custom unit test suite for testing functionality of the various classes. To run tests, simply do the following:

# Run tests for Redis class (note this is the default)
php tests/TestRedis.php --class Redis

# Run tests for RedisArray class
tests/mkring.sh start
php tests/TestRedis.php --class RedisArray
tests/mkring.sh stop

# Run tests for the RedisCluster class
tests/make-cluster.sh start
php tests/TestRedis.php --class RedisCluster
tests/make-cluster.sh stop

# Run tests for RedisSentinel class
php tests/TestRedis.php --class RedisSentinel

Note that it is possible to run only tests which match a substring of the test itself by passing the additional argument '--test ' when invoking.

# Just run the 'echo' test
php tests/TestRedis.php --class Redis --test echo

Classes and methods

Usage

1. Class Redis
2. Class RedisException
3. Predefined constants

Class Redis

Description: Creates a Redis client

Example

$redis = new Redis();

Class RedisException

phpredis throws a RedisException object if it can't reach the Redis server. That can happen in case of connectivity issues, if the Redis service is down, or if the redis host is overloaded. In any other problematic case that does not involve an unreachable server (such as a key not existing, an invalid command, etc), phpredis will return FALSE.

Predefined constants

Description: Available Redis Constants

Redis data types, as returned by type

Redis::REDIS_STRING - String
Redis::REDIS_SET - Set
Redis::REDIS_LIST - List
Redis::REDIS_ZSET - Sorted set
Redis::REDIS_HASH - Hash
Redis::REDIS_NOT_FOUND - Not found / other

@TODO: OPT_SERIALIZER, AFTER, BEFORE,...

Connection

1. connect, open - Connect to a server
2. pconnect, popen - Connect to a server (persistent)
3. auth - Authenticate to the server
4. select - Change the selected database for the current connection
5. swapdb - Swaps two Redis databases
6. close - Close the connection
7. setOption - Set client option
8. getOption - Get client option
9. ping - Ping the server
10. echo - Echo the given string

connect, open

Description: Connects to a Redis instance.

Parameters

host: string. can be a host, or the path to a unix domain socket. Starting from version 5.0.0 it is possible to specify schema port: int, optional
timeout: float, value in seconds (optional, default is 0 meaning unlimited)
reserved: should be NULL if retry_interval is specified
retry_interval: int, value in milliseconds (optional)
read_timeout: float, value in seconds (optional, default is 0 meaning unlimited)

Return value

BOOL: TRUE on success, FALSE on error.

Example

$redis->connect('127.0.0.1', 6379);
$redis->connect('127.0.0.1'); // port 6379 by default
$redis->connect('tls://127.0.0.1', 6379); // enable transport level security.
$redis->connect('tls://127.0.0.1'); // enable transport level security, port 6379 by default.
$redis->connect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout.
$redis->connect('/tmp/redis.sock'); // unix domain socket.
$redis->connect('127.0.0.1', 6379, 1, NULL, 100); // 1 sec timeout, 100ms delay between reconnection attempts.

/* With PhpRedis >= 5.3.0 you can specify authentication information on connect */
$redis->connect('127.0.0.1', 6379, 1, NULL, 0, 0, ['auth' => ['phpredis', 'phpredis']]);

Note: open is an alias for connect and will be removed in future versions of phpredis.

pconnect, popen

Description: Connects to a Redis instance or reuse a connection already established with pconnect/popen.

The connection will not be closed on end of request until the php process ends. So be prepared for too many open FD's errors (specially on redis server side) when using persistent connections on many servers connecting to one redis server.

Also more than one persistent connection can be made identified by either host + port + timeout or host + persistent_id or unix socket + timeout.

Starting from version 4.2.1, it became possible to use connection pooling by setting INI variable redis.pconnect.pooling_enabled to 1.

This feature is not available in threaded versions. pconnect and popen then working like their non persistent equivalents.

Parameters

host: string. can be a host, or the path to a unix domain socket. Starting from version 5.0.0 it is possible to specify schema port: int, optional
timeout: float, value in seconds (optional, default is 0 meaning unlimited)
persistent_id: string. identity for the requested persistent connection
retry_interval: int, value in milliseconds (optional)
read_timeout: float, value in seconds (optional, default is 0 meaning unlimited)

Return value

BOOL: TRUE on success, FALSE on error.

Example

$redis->pconnect('127.0.0.1', 6379);
$redis->pconnect('127.0.0.1'); // port 6379 by default - same connection like before.
$redis->pconnect('tls://127.0.0.1', 6379); // enable transport level security.
$redis->pconnect('tls://127.0.0.1'); // enable transport level security, port 6379 by default.
$redis->pconnect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout and would be another connection than the two before.
$redis->pconnect('127.0.0.1', 6379, 2.5, 'x'); // x is sent as persistent_id and would be another connection than the three before.
$redis->pconnect('/tmp/redis.sock'); // unix domain socket - would be another connection than the four before.

Note: popen is an alias for pconnect and will be removed in future versions of phpredis.

auth

Description: Authenticate the connection using a password or a username and password. Warning: The password is sent in plain-text over the network.

Parameters

MIXED: password

Return value

BOOL: TRUE if the connection is authenticated, FALSE otherwise.

Note: In order to authenticate with a username and password you need Redis >= 6.0.

Example

/* Authenticate with the password 'foobared' */
$redis->auth('foobared');

/* Authenticate with the username 'phpredis', and password 'haxx00r' */
$redis->auth(['phpredis', 'haxx00r']);

/* Authenticate with the password 'foobared' */
$redis->auth(['foobared']);

/* You can also use an associative array specifying user and pass */
$redis->auth(['user' => 'phpredis', 'pass' => 'phpredis']);
$redis->auth(['pass' => 'phpredis']);

select

Description: Change the selected database for the current connection.

Parameters

INTEGER: dbindex, the database number to switch to.

Return value

TRUE in case of success, FALSE in case of failure.

Example

See method for example: move

swapdb

Description: Swap one Redis database with another atomically

Parameters

INTEGER: db1
INTEGER: db2

Return value

TRUE on success and FALSE on failure.

Note: Requires Redis >= 4.0.0

Example

$redis->swapdb(0, 1); /* Swaps DB 0 with DB 1 atomically */

close

Description: Disconnects from the Redis instance.

Note: Closing a persistent connection requires PhpRedis >= 4.2.0.

Parameters

None.

Return value

BOOL: TRUE on success, FALSE on failure.

setOption

Description: Set client option.

Parameters

parameter name
parameter value

Return value

BOOL: TRUE on success, FALSE on error.

Example

$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_NONE);	  // Don't serialize data
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP);	  // Use built-in serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_IGBINARY); // Use igBinary serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_MSGPACK);  // Use msgpack serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_JSON);  // Use JSON to serialize/unserialize

$redis->setOption(Redis::OPT_PREFIX, 'myAppName:');	// use custom prefix on all keys

/* Options for the SCAN family of commands, indicating whether to abstract
   empty results from the user.  If set to SCAN_NORETRY (the default), phpredis
   will just issue one SCAN command at a time, sometimes returning an empty
   array of results.  If set to SCAN_RETRY, phpredis will retry the scan command
   until keys come back OR Redis returns an iterator of zero
*/
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NORETRY);
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);

/* Scan can also be configured to automatically prepend the currently set PhpRedis
   prefix to any MATCH pattern. */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_PREFIX);
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NOPREFIX);

getOption

Description: Get client option.

Parameters

parameter name

Return value

Parameter value.

Example

// return Redis::SERIALIZER_NONE, Redis::SERIALIZER_PHP, 
//        Redis::SERIALIZER_IGBINARY, Redis::SERIALIZER_MSGPACK or Redis::SERIALIZER_JSON
$redis->getOption(Redis::OPT_SERIALIZER);

ping

Description: Check the current connection status.

Prototype

$redis->ping([string $message]);

Return value

Mixed: This method returns TRUE on success, or the passed string if called with an argument.

Example

/* When called without an argument, PING returns `TRUE` */
$redis->ping();

/* If passed an argument, that argument is returned.  Here 'hello' will be returned */
$redis->ping('hello');

Note: Prior to PhpRedis 5.0.0 this command simply returned the string +PONG.

echo

Description: Sends a string to Redis, which replies with the same string

Parameters

STRING: The message to send.

Return value

STRING: the same message.

Retry and backoff

1. Maximum retries
2. Backoff algorithms

Maximum retries

You can set and get the maximum retries upon connection issues using the OPT_MAX_RETRIES option. Note that this is the number of retries, meaning if you set this option to n, there will be a maximum n+1 attemps overall. Defaults to 10.

Example

$redis->setOption(Redis::OPT_MAX_RETRIES, 5);
$redis->getOption(Redis::OPT_MAX_RETRIES);

Backoff algorithms

You can set the backoff algorithm using the Redis::OPT_BACKOFF_ALGORITHM option and choose among the following algorithms described in this blog post by Marc Brooker from AWS: Exponential Backoff And Jitter:

• Default: Redis::BACKOFF_ALGORITHM_DEFAULT
• Decorrelated jitter: Redis::BACKOFF_ALGORITHM_DECORRELATED_JITTER
• Full jitter: Redis::BACKOFF_ALGORITHM_FULL_JITTER
• Equal jitter: Redis::BACKOFF_ALGORITHM_EQUAL_JITTER
• Exponential: Redis::BACKOFF_ALGORITHM_EXPONENTIAL
• Uniform: Redis::BACKOFF_ALGORITHM_UNIFORM
• Constant: Redis::BACKOFF_ALGORITHM_CONSTANT

These algorithms depend on the base and cap parameters, both in milliseconds, which you can set using the Redis::OPT_BACKOFF_BASE and Redis::OPT_BACKOFF_CAP options, respectively.

Example

$redis->setOption(Redis::OPT_BACKOFF_ALGORITHM, Redis::BACKOFF_ALGORITHM_DECORRELATED_JITTER);
$redis->setOption(Redis::OPT_BACKOFF_BASE, 500); // base for backoff computation: 500ms
$redis->setOption(Redis::OPT_BACKOFF_CAP, 750); // backoff time capped at 750ms

Server

1. acl - Manage Redis ACLs
2. bgRewriteAOF - Asynchronously rewrite the append-only file
3. bgSave - Asynchronously save the dataset to disk (in background)
4. config - Get or Set the Redis server configuration parameters
5. dbSize - Return the number of keys in selected database
6. flushAll - Remove all keys from all databases
7. flushDb - Remove all keys from the current database
8. info - Get information and statistics about the server
9. lastSave - Get the timestamp of the last disk save
10. resetStat - Reset the stats returned by info method.
11. save - Synchronously save the dataset to disk (wait to complete)
12. slaveOf - Make the server a slave of another instance, or promote it to master
13. time - Return the current server time
14. slowLog - Access the Redis slowLog entries

acl

Description: Execute the Redis ACL command.

Parameters

variable: Minumum of one argument for Redis and two for RedisCluster.

Example

$redis->acl('USERS'); /* Get a list of users */
$redis->acl('LOG');   /* See log of Redis' ACL subsystem */

Note: In order to user the ACL command you must be communicating with Redis >= 6.0 and be logged into an account that has access to administration commands such as ACL. Please reference this tutorial for an overview of Redis 6 ACLs and the redis command reference for every ACL subcommand.

Note: If you are connecting to Redis server >= 4.0.0 you can remove a key with the unlink method in the exact same way you would use del. The Redis unlink command is non-blocking and will perform the actual deletion asynchronously.

bgRewriteAOF

Description: Start the background rewrite of AOF (Append-Only File)

Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example

$redis->bgRewriteAOF();

bgSave

Description: Asynchronously save the dataset to disk (in background)

Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.

Example

$redis->bgSave();

config

Description: Get or Set the Redis server configuration parameters.

Parameters

operation (string) either GET or SET
key string for SET, glob-pattern for GET. See http://redis.io/commands/config-get for examples.
value optional string (only for SET)

Return value

Associative array for GET, key -> value
bool for SET

Examples

$redis->config("GET", "*max-*-entries*");
$redis->config("SET", "dir", "/var/run/redis/dumps/");

dbSize

Description: Return the number of keys in selected database.

Parameters

None.

Return value

INTEGER: DB size, in number of keys.

Example

$count = $redis->dbSize();
echo "Redis has $count keys\n";

flushAll

Description: Remove all keys from all databases.

Parameters

async (bool) requires server version 4.0.0 or greater

Return value

BOOL: Always TRUE.

Example

$redis->flushAll();

flushDb

Description: Remove all keys from the current database.

Parameters

async (bool) requires server version 4.0.0 or greater

Return value

BOOL: Always TRUE.

Example

$redis->flushDb();

info

Description: Get information and statistics about the server

Returns an associative array that provides information about the server. Passing no arguments to INFO will call the standard REDIS INFO command, which returns information such as the following:

• redis_version
• arch_bits
• uptime_in_seconds
• uptime_in_days
• connected_clients
• connected_slaves
• used_memory
• changes_since_last_save
• bgsave_in_progress
• last_save_time
• total_connections_received
• total_commands_processed
• role

You can pass a variety of options to INFO (per the Redis documentation), which will modify what is returned.

Parameters

option: The option to provide redis (e.g. "COMMANDSTATS", "CPU")

Example

$redis->info(); /* standard redis INFO command */
$redis->info("COMMANDSTATS"); /* Information on the commands that have been run (>=2.6 only)
$redis->info("CPU"); /* just CPU information from Redis INFO */

lastSave

Description: Returns the timestamp of the last disk save.

Parameters

None.

Return value

INT: timestamp.

Example

$redis->lastSave();

resetStat

Description: Reset the stats returned by info method.

These are the counters that are reset:

• Keyspace hits
• Keyspace misses
• Number of commands processed
• Number of connections received
• Number of expired keys

Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example

$redis->resetStat();

save

Description: Synchronously save the dataset to disk (wait to complete)

Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.

Example

$redis->save();

slaveOf

Description: Changes the slave status

Parameters

Either host (string) and port (int), or no parameter to stop being a slave.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example

$redis->slaveOf('10.0.1.7', 6379);
/* ... */
$redis->slaveOf();

time

Description: Return the current server time.

Parameters

(none)

Return value

If successful, the time will come back as an associative array with element zero being the unix timestamp, and element one being microseconds.

Examples

$redis->time();

slowLog

Description: Access the Redis slowLog

Parameters

Operation (string): This can be either GET, LEN, or RESET
Length (integer), optional: If executing a SLOWLOG GET command, you can pass an optional length.

Return value

The return value of SLOWLOG will depend on which operation was performed. SLOWLOG GET: Array of slowLog entries, as provided by Redis SLOGLOG LEN: Integer, the length of the slowLog SLOWLOG RESET: Boolean, depending on success

Examples

// Get ten slowLog entries
$redis->slowLog('get', 10);
// Get the default number of slowLog entries

$redis->slowLog('get');
// Reset our slowLog
$redis->slowLog('reset');

// Retrieve slowLog length
$redis->slowLog('len');

Keys and Strings

Strings

• append - Append a value to a key
• bitCount - Count set bits in a string
• bitOp - Perform bitwise operations between strings
• decr, decrBy - Decrement the value of a key
• get - Get the value of a key
• getBit - Returns the bit value at offset in the string value stored at key
• getRange - Get a substring of the string stored at a key
• getSet - Set the string value of a key and return its old value
• incr, incrBy - Increment the value of a key
• incrByFloat - Increment the float value of a key by the given amount
• mGet, getMultiple - Get the values of all the given keys
• mSet, mSetNX - Set multiple keys to multiple values
• set - Set the string value of a key
• setBit - Sets or clears the bit at offset in the string value stored at key
• setEx, pSetEx - Set the value and expiration of a key
• setNx - Set the value of a key, only if the key does not exist
• setRange - Overwrite part of a string at key starting at the specified offset
• strLen - Get the length of the value stored in a key

Keys

• del, delete, unlink - Delete a key
• dump - Return a serialized version of the value stored at the specified key.
• exists - Determine if a key exists
• expire, setTimeout, pexpire - Set a key's time to live in seconds
• expireAt, pexpireAt - Set the expiration for a key as a UNIX timestamp
• keys, getKeys - Find all keys matching the given pattern
• scan - Scan for keys in the keyspace (Redis >= 2.8.0)
• migrate - Atomically transfer a key from a Redis instance to another one
• move - Move a key to another database
• object - Inspect the internals of Redis objects
• persist - Remove the expiration from a key
• randomKey - Return a random key from the keyspace
• rename, renameKey - Rename a key
• renameNx - Rename a key, only if the new key does not exist
• type - Determine the type stored at key
• sort - Sort the elements in a list, set or sorted set
• ttl, pttl - Get the time to live for a key
• restore - Create a key using the provided serialized value, previously obtained with dump.

get

Description: Get the value related to the specified key

Parameters

key

Return value

String or Bool: If key didn't exist, FALSE is returned. Otherwise, the value related to this key is returned.

Examples

$redis->get('key');

set

Description: Set the string value in argument as value of the key. If you're using Redis >= 2.6.12, you can pass extended options as explained below

Parameters

Key
Value
Timeout or Options Array (optional). If you pass an integer, phpredis will redirect to SETEX, and will try to use Redis >= 2.6.12 extended options if you pass an array with valid values

Return value

Bool TRUE if the command is successful.

Examples

// Simple key -> value set
$redis->set('key', 'value');

// Will redirect, and actually make an SETEX call
$redis->set('key','value', 10);

// Will set the key, if it doesn't exist, with a ttl of 10 seconds
$redis->set('key', 'value', ['nx', 'ex'=>10]);

// Will set a key, if it does exist, with a ttl of 1000 milliseconds
$redis->set('key', 'value', ['xx', 'px'=>1000]);

setEx, pSetEx

Description: Set the string value in argument as value of the key, with a time to live. PSETEX uses a TTL in milliseconds.

Parameters

Key TTL Value

Return value

Bool TRUE if the command is successful.

Examples

$redis->setEx('key', 3600, 'value'); // sets key → value, with 1h TTL.
$redis->pSetEx('key', 100, 'value'); // sets key → value, with 0.1 sec TTL.

setNx

Description: Set the string value in argument as value of the key if the key doesn't already exist in the database.

Parameters

key value

Return value

Bool TRUE in case of success, FALSE in case of failure.

Examples

$redis->setNx('key', 'value'); /* return TRUE */
$redis->setNx('key', 'value'); /* return FALSE */

del, delete, unlink

Description: Remove specified keys.

Parameters

An array of keys, or an undefined number of parameters, each a key: key1 key2 key3 ... keyN

Note: If you are connecting to Redis server >= 4.0.0 you can remove a key with the unlink method in the exact same way you would use del. The Redis unlink command is non-blocking and will perform the actual deletion asynchronously.

Return value

Long Number of keys deleted.

Examples

$redis->set('key1', 'val1');
$redis->set('key2', 'val2');
$redis->set('key3', 'val3');
$redis->set('key4', 'val4');

$redis->del('key1', 'key2'); /* return 2 */
$redis->del(['key3', 'key4']); /* return 2 */

/* If using Redis >= 4.0.0 you can call unlink */
$redis->unlink('key1', 'key2');
$redis->unlink(['key1', 'key2']);

Note: delete is an alias for del and will be removed in future versions of phpredis.

exists

Description: Verify if the specified key exists.

Parameters

key

Return value

long: The number of keys tested that do exist.

Examples

$redis->set('key', 'value');
$redis->exists('key'); /* 1 */
$redis->exists('NonExistingKey'); /* 0 */

$redis->mset(['foo' => 'foo', 'bar' => 'bar', 'baz' => 'baz']);
$redis->exists(['foo', 'bar', 'baz']); /* 3 */
$redis->exists('foo', 'bar', 'baz'); /* 3 */

Note: This function took a single argument and returned TRUE or FALSE in phpredis versions < 4.0.0.

incr, incrBy

Description: Increment the number stored at key by one. If the second argument is filled, it will be used as the integer value of the increment.

Parameters

key
value: value that will be added to key (only for incrBy)

Return value

INT the new value

Examples

$redis->incr('key1'); /* key1 didn't exists, set to 0 before the increment */
					  /* and now has the value 1  */

$redis->incr('key1'); /* 2 */
$redis->incr('key1'); /* 3 */
$redis->incr('key1'); /* 4 */

// Will redirect, and actually make an INCRBY call
$redis->incr('key1', 10);   /* 14 */

$redis->incrBy('key1', 10); /* 24 */

incrByFloat

Description: Increment the key with floating point precision.

Parameters

key
value: (float) value that will be added to the key

Return value

FLOAT the new value

Examples

$redis->incrByFloat('key1', 1.5); /* key1 didn't exist, so it will now be 1.5 */


$redis->incrByFloat('key1', 1.5); /* 3 */
$redis->incrByFloat('key1', -1.5); /* 1.5 */
$redis->incrByFloat('key1', 2.5); /* 4 */

decr, decrBy

Description: Decrement the number stored at key by one. If the second argument is filled, it will be used as the integer value of the decrement.

Parameters

key
value: value that will be subtracted to key (only for decrBy)

Return value

INT the new value

Examples

$redis->decr('key1'); /* key1 didn't exists, set to 0 before the increment */
					  /* and now has the value -1  */

$redis->decr('key1'); /* -2 */
$redis->decr('key1'); /* -3 */

// Will redirect, and actually make an DECRBY call
$redis->decr('key1', 10);   /* -13 */

$redis->decrBy('key1', 10); /* -23 */

mGet, getMultiple

Description: Get the values of all the specified keys. If one or more keys don't exist, the array will contain FALSE at the position of the key.

Parameters

Array: Array containing the list of the keys

Return value

Array: Array containing the values related to keys in argument

Examples

$redis->set('key1', 'value1');
$redis->set('key2', 'value2');
$redis->set('key3', 'value3');
$redis->mGet(['key1', 'key2', 'key3']); /* ['value1', 'value2', 'value3'];
$redis->mGet(['key0', 'key1', 'key5']); /* [`FALSE`, 'value1', `FALSE`];

Note: getMultiple is an alias for mGet and will be removed in future versions of phpredis.

getSet

Description: Sets a value and returns the previous entry at that key.

Parameters

Key: key

STRING: value

Return value

A string, the previous value located at this key.

Example

$redis->set('x', '42');
$exValue = $redis->getSet('x', 'lol');	// return '42', replaces x by 'lol'
$newValue = $redis->get('x')'		// return 'lol'

randomKey

Description: Returns a random key.

Parameters

None.

Return value

STRING: an existing key in redis.

Example

$key = $redis->randomKey();
$surprise = $redis->get($key);	// who knows what's in there.

move

Description: Moves a key to a different database.

Parameters

Key: key, the key to move.

INTEGER: dbindex, the database number to move the key to.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example

$redis->select(0);	// switch to DB 0
$redis->set('x', '42');	// write 42 to x
$redis->move('x', 1);	// move to DB 1
$redis->select(1);	// switch to DB 1
$redis->get('x');	// will return 42

rename, renameKey

Description: Renames a key.

Parameters

STRING: srckey, the key to rename.

STRING: dstkey, the new name for the key.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example

$redis->set('x', '42');
$redis->rename('x', 'y');
$redis->get('y'); 	// → 42
$redis->get('x'); 	// → `FALSE`

Note: renameKey is an alias for rename and will be removed in future versions of phpredis.

renameNx

Description: Same as rename, but will not replace a key if the destination already exists. This is the same behaviour as setNx.

expire, setTimeout, pexpire

Description: Sets an expiration date (a timeout) on an item. pexpire requires a TTL in milliseconds.

Parameters

Key: key. The key that will disappear.

Integer: ttl. The key's remaining Time To Live, in seconds.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example

$redis->set('x', '42');
$redis->expire('x', 3);	// x will disappear in 3 seconds.
sleep(5);				// wait 5 seconds
$redis->get('x'); 		// will return `FALSE`, as 'x' has expired.

Note: setTimeout is an alias for expire and will be removed in future versions of phpredis.

expireAt, pexpireAt

Description: Sets an expiration date (a timestamp) on an item. pexpireAt requires a timestamp in milliseconds.

Parameters

Key: key. The key that will disappear.

Integer: Unix timestamp. The key's date of death, in seconds from Epoch time.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example

$redis->set('x', '42');
$now = time(NULL); // current timestamp
$redis->expireAt('x', $now + 3);	// x will disappear in 3 seconds.
sleep(5);				// wait 5 seconds
$redis->get('x'); 		// will return `FALSE`, as 'x' has expired.

keys, getKeys

Description: Returns the keys that match a certain pattern.

Parameters

STRING: pattern, using '*' as a wildcard.

Return value

Array of STRING: The keys that match a certain pattern.

Example

$allKeys = $redis->keys('*');	// all keys will match this.
$keyWithUserPrefix = $redis->keys('user*');

Note: getKeys is an alias for keys and will be removed in future versions of phpredis.

scan

Description: Scan the keyspace for keys

Parameters

LONG (reference): Iterator, initialized to NULL STRING, Optional: Pattern to match LONG, Optional: Count of keys per iteration (only a suggestion to Redis)

Return value

Array, boolean: This function will return an array of keys or FALSE if Redis returned zero keys

Note: SCAN is a "directed node" command in RedisCluster

Example

/* Without enabling Redis::SCAN_RETRY (default condition) */
$it = NULL;
do {
    // Scan for some keys
    $arr_keys = $redis->scan($it);

    // Redis may return empty results, so protect against that
    if ($arr_keys !== FALSE) {
        foreach($arr_keys as $str_key) {
            echo "Here is a key: $str_key\n";
        }
    }
} while ($it > 0);
echo "No more keys to scan!\n";

/* With Redis::SCAN_RETRY enabled */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
$it = NULL;

/* phpredis will retry the SCAN command if empty results are returned from the
   server, so no empty results check is required. */
while ($arr_keys = $redis->scan($it)) {
    foreach ($arr_keys as $str_key) {
        echo "Here is a key: $str_key\n";
    }
}
echo "No more keys to scan!\n";

object

Description: Describes the object pointed to by a key.

Parameters

The information to retrieve (string) and the key (string). Info can be one of the following:

• "encoding"
• "refcount"
• "idletime"

Return value

STRING for "encoding", LONG for "refcount" and "idletime", FALSE if the key doesn't exist.

Example

$redis->object("encoding", "l"); // → ziplist
$redis->object("refcount", "l"); // → 1
$redis->object("idletime", "l"); // → 400 (in seconds, with a precision of 10 seconds).

type

Description: Returns the type of data pointed by a given key.

Parameters

Key: key

Return value

Depending on the type of the data pointed by the key, this method will return the following value:
string: Redis::REDIS_STRING
set: Redis::REDIS_SET
list: Redis::REDIS_LIST
zset: Redis::REDIS_ZSET
hash: Redis::REDIS_HASH
other: Redis::REDIS_NOT_FOUND

Example

$redis->type('key');

append

Description: Append specified string to the string stored in specified key.

Parameters

Key Value

Return value

INTEGER: Size of the value after the append

Example

$redis->set('key', 'value1');
$redis->append('key', 'value2'); /* 12 */
$redis->get('key'); /* 'value1value2' */

getRange

Description: Return a substring of a larger string

Parameters

key
start
end

Return value

STRING: the substring

Example

$redis->set('key', 'string value');
$redis->getRange('key', 0, 5); /* 'string' */
$redis->getRange('key', -5, -1); /* 'value' */

Note: substr is an alias for getRange and will be removed in future versions of phpredis.

setRange

Description: Changes a substring of a larger string.

Parameters

key offset value

Return value

STRING: the length of the string after it was modified.

Example

$redis->set('key', 'Hello world');
$redis->setRange('key', 6, "redis"); /* returns 11 */
$redis->get('key'); /* "Hello redis" */

strLen

Description: Get the length of a string value.

Parameters

key

Return value

INTEGER

Example

$redis->set('key', 'value');
$redis->strlen('key'); /* 5 */

getBit

Description: Return a single bit out of a larger string

Parameters

key
offset

Return value

LONG: the bit value (0 or 1)

Example

$redis->set('key', "\x7f"); // this is 0111 1111
$redis->getBit('key', 0); /* 0 */
$redis->getBit('key', 1); /* 1 */

setBit

Description: Changes a single bit of a string.

Parameters

key
offset
value: bool or int (1 or 0)

Return value

LONG: 0 or 1, the value of the bit before it was set.

Example

$redis->set('key', "*");	// ord("*") = 42 = 0x2f = "0010 1010"
$redis->setBit('key', 5, 1); /* returns 0 */
$redis->setBit('key', 7, 1); /* returns 0 */
$redis->get('key'); /* chr(0x2f) = "/" = b("0010 1111") */

bitOp

Description: Bitwise operation on multiple keys.

Parameters

operation: either "AND", "OR", "NOT", "XOR"
ret_key: return key
key1
key2...

Return value

LONG: The size of the string stored in the destination key.

bitCount

Description: Count bits in a string.

Parameters

key

Return value

LONG: The number of bits set to 1 in the value behind the input key.

sort

Description: Sort the elements in a list, set or sorted set.

Parameters

Key: key Options: [key => value, ...] - optional, with the following keys and values:

    'by' => 'some_pattern_*',
    'limit' => [0, 1],
    'get' => 'some_other_pattern_*' or an array of patterns,
    'sort' => 'asc' or 'desc',
    'alpha' => TRUE,
    'store' => 'external-key'

Return value

An array of values, or a number corresponding to the number of elements stored if that was used.

Example

$redis->del('s');
$redis->sAdd('s', 5);
$redis->sAdd('s', 4);
$redis->sAdd('s', 2);
$redis->sAdd('s', 1);
$redis->sAdd('s', 3);

var_dump($redis->sort('s')); // 1,2,3,4,5
var_dump($redis->sort('s', ['sort' => 'desc'])); // 5,4,3,2,1
var_dump($redis->sort('s', ['sort' => 'desc', 'store' => 'out'])); // (int)5

ttl, pttl

Description: Returns the time to live left for a given key in seconds (ttl), or milliseconds (pttl).

Parameters

Key: key

Return value

LONG: The time to live in seconds. If the key has no ttl, -1 will be returned, and -2 if the key doesn't exist.

Example

$redis->ttl('key');

persist

Description: Remove the expiration timer from a key.

Parameters

Key: key

Return value

BOOL: TRUE if a timeout was removed, FALSE if the key didn’t exist or didn’t have an expiration timer.

Example

$redis->persist('key');

mSet, mSetNx

Description: Sets multiple key-value pairs in one atomic command. MSETNX only returns TRUE if all the keys were set (see SETNX).

Parameters

Pairs: [key => value, ...]

Return value

Bool TRUE in case of success, FALSE in case of failure.

Example

$redis->mSet(['key0' => 'value0', 'key1' => 'value1']);
var_dump($redis->get('key0'));
var_dump($redis->get('key1'));

Output:

string(6) "value0"
string(6) "value1"

dump

Description: Dump a key out of a redis database, the value of which can later be passed into redis using the RESTORE command. The data that comes out of DUMP is a binary representation of the key as Redis stores it.

Parameters

key string

Return value

The Redis encoded value of the key, or FALSE if the key doesn't exist

Examples

$redis->set('foo', 'bar');
$val = $redis->dump('foo'); // $val will be the Redis encoded key value

restore

Description: Restore a key from the result of a DUMP operation.

Parameters

key string. The key name
ttl integer. How long the key should live (if zero, no expire will be set on the key)
value string (binary). The Redis encoded key value (from DUMP)

Examples

$redis->set('foo', 'bar');
$val = $redis->dump('foo');
$redis->restore('bar', 0, $val); // The key 'bar', will now be equal to the key 'foo'

migrate

Description: Migrates a key to a different Redis instance.

Note:: Redis introduced migrating multiple keys in 3.0.6, so you must have at least that version in order to call migrate with an array of keys.

Parameters

host string. The destination host
port integer. The TCP port to connect to.
key(s) string or array.
destination-db integer. The target DB.
timeout integer. The maximum amount of time given to this transfer.
copy boolean, optional. Should we send the COPY flag to redis.
replace boolean, optional. Should we send the REPLACE flag to redis

Examples

$redis->migrate('backup', 6379, 'foo', 0, 3600);
$redis->migrate('backup', 6379, 'foo', 0, 3600, true, true); /* copy and replace */
$redis->migrate('backup', 6379, 'foo', 0, 3600, false, true); /* just REPLACE flag */

/* Migrate multiple keys (requires Redis >= 3.0.6)
$redis->migrate('backup', 6379, ['key1', 'key2', 'key3'], 0, 3600);

Hashes

• hDel - Delete one or more hash fields
• hExists - Determine if a hash field exists
• hGet - Get the value of a hash field
• hGetAll - Get all the fields and values in a hash
• hIncrBy - Increment the integer value of a hash field by the given number
• hIncrByFloat - Increment the float value of a hash field by the given amount
• hKeys - Get all the fields in a hash
• hLen - Get the number of fields in a hash
• hMGet - Get the values of all the given hash fields
• hMSet - Set multiple hash fields to multiple values
• hSet - Set the string value of a hash field
• hSetNx - Set the value of a hash field, only if the field does not exist
• hVals - Get all the values in a hash
• hScan - Scan a hash key for members
• hStrLen - Get the string length of the value associated with field in the hash

hSet

Description: Adds a value to the hash stored at key.

Parameters

key
hashKey
value

Return value

LONG 1 if value didn't exist and was added successfully, 0 if the value was already present and was replaced, FALSE if there was an error.

Example

$redis->del('h')
$redis->hSet('h', 'key1', 'hello'); /* 1, 'key1' => 'hello' in the hash at "h" */
$redis->hGet('h', 'key1'); /* returns "hello" */

$redis->hSet('h', 'key1', 'plop'); /* 0, value was replaced. */
$redis->hGet('h', 'key1'); /* returns "plop" */

hSetNx

Description: Adds a value to the hash stored at key only if this field isn't already in the hash.

Return value

BOOL TRUE if the field was set, FALSE if it was already present.

Example

$redis->del('h')
$redis->hSetNx('h', 'key1', 'hello'); /* TRUE, 'key1' => 'hello' in the hash at "h" */
$redis->hSetNx('h', 'key1', 'world'); /* FALSE, 'key1' => 'hello' in the hash at "h". No change since the field wasn't replaced. */

hGet

Description: Gets a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.

Parameters

key
hashKey

Return value

STRING The value, if the command executed successfully
BOOL FALSE in case of failure

hLen

Description: Returns the length of a hash, in number of items

Parameters

key

Return value

LONG the number of items in a hash, FALSE if the key doesn't exist or isn't a hash.

Example

$redis->del('h')
$redis->hSet('h', 'key1', 'hello');
$redis->hSet('h', 'key2', 'plop');
$redis->hLen('h'); /* returns 2 */

hDel

Description: Removes a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.

Parameters

key
hashKey1
hashKey2
...

Return value

LONG the number of deleted keys, 0 if the key doesn't exist, FALSE if the key isn't a hash.

hKeys

Description: Returns the keys in a hash, as an array of strings.

Parameters

Key: key

Return value

An array of elements, the keys of the hash. This works like PHP's array_keys().

Example

$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hKeys('h'));

Output:

array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

The order is random and corresponds to redis' own internal representation of the set structure.

hVals

Description: Returns the values in a hash, as an array of strings.

Parameters

Key: key

Return value

An array of elements, the values of the hash. This works like PHP's array_values().

Example

$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hVals('h'));

Output:

array(4) {
  [0]=>
  string(1) "x"
  [1]=>
  string(1) "y"
  [2]=>
  string(1) "z"
  [3]=>
  string(1) "t"
}

The order is random and corresponds to redis' own internal representation of the set structure.

hGetAll

Description: Returns the whole hash, as an array of strings indexed by strings.

Parameters

Key: key

Return value

An array of elements, the contents of the hash.

Example

$redis->del('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hGetAll('h'));

Output:

array(4) {
  ["a"]=>
  string(1) "x"
  ["b"]=>
  string(1) "y"
  ["c"]=>
  string(1) "z"
  ["d"]=>
  string(1) "t"
}

The order is random and corresponds to redis' own internal representation of the set structure.

hExists

Description: Verify if the specified member exists in a key.

Parameters

key
memberKey

Return value

BOOL: If the member exists in the hash table, return TRUE, otherwise return FALSE.

Examples

$redis->hSet('h', 'a', 'x');
$redis->hExists('h', 'a'); /*  TRUE */
$redis->hExists('h', 'NonExistingKey'); /* FALSE */

hIncrBy

Description: Increments the value of a member from a hash by a given amount.

Parameters

key
member
value: (integer) value that will be added to the member's value

Return value

LONG the new value

Examples

$redis->del('h');
$redis->hIncrBy('h', 'x', 2); /* returns 2: h[x] = 2 now. */
$redis->hIncrBy('h', 'x', 1); /* h[x] ← 2 + 1. Returns 3 */

hIncrByFloat

Description: Increments the value of a hash member by the provided float value

Parameters

key
member
value: (float) value that will be added to the member's value

Return value

FLOAT the new value

Examples

$redis->del('h');
$redis->hIncrByFloat('h','x', 1.5); /* returns 1.5: h[x] = 1.5 now */
$redis->hIncrByFloat('h', 'x', 1.5); /* returns 3.0: h[x] = 3.0 now */
$redis->hIncrByFloat('h', 'x', -3.0); /* returns 0.0: h[x] = 0.0 now */

hMSet

Description: Fills in a whole hash. Non-string values are converted to string, using the standard (string) cast. NULL values are stored as empty strings.

Parameters

key
members: key → value array

Return value

BOOL

Examples

$redis->del('user:1');
$redis->hMSet('user:1', ['name' => 'Joe', 'salary' => 2000]);
$redis->hIncrBy('user:1', 'salary', 100); // Joe earns 100 more now.

hMGet

Description: Retrieve the values associated to the specified fields in the hash.

Parameters

key
memberKeys Array

Return value

Array An array of elements, the values of the specified fields in the hash, with the hash keys as array keys.

Examples

$redis->del('h');
$redis->hSet('h', 'field1', 'value1');
$redis->hSet('h', 'field2', 'value2');
$redis->hMGet('h', ['field1', 'field2']); /* returns ['field1' => 'value1', 'field2' => 'value2'] */

hScan

Description: Scan a HASH value for members, with an optional pattern and count

Parameters

key: String
iterator: Long (reference)
pattern: Optional pattern to match against
count: How many keys to return in a go (only a suggestion to Redis)

Return value

Array An array of members that match our pattern

Examples

$it = NULL;
/* Don't ever return an empty array until we're done iterating */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
while($arr_keys = $redis->hScan('hash', $it)) {
    foreach($arr_keys as $str_field => $str_value) {
        echo "$str_field => $str_value\n"; /* Print the hash member and value */
    }
}

hStrLen

Description: Get the string length of the value associated with field in the hash stored at key.

Parameters

key: String
field: String

Return value

LONG the string length of the value associated with field, or zero when field is not present in the hash or key does not exist at all.

Lists

• blPop, brPop - Remove and get the first/last element in a list
• bRPopLPush - Pop a value from a list, push it to another list and return it
• lIndex, lGet - Get an element from a list by its index
• lInsert - Insert an element before or after another element in a list
• lLen, lSize - Get the length/size of a list
• lPop - Remove and get the first element in a list
• lPush - Prepend one or multiple values to a list
• lPushx - Prepend a value to a list, only if the list exists
• lRange, lGetRange - Get a range of elements from a list
• lRem, lRemove - Remove elements from a list
• lSet - Set the value of an element in a list by its index
• lTrim, listTrim - Trim a list to the specified range
• rPop - Remove and get the last element in a list
• rPopLPush - Remove the last element in a list, append it to another list and return it (redis >= 1.1)
• rPush - Append one or multiple values to a list
• rPushX - Append a value to a list, only if the list exists

blPop, brPop

Description: Is a blocking lPop(rPop) primitive. If at least one of the lists contains at least one element, the element will be popped from the head of the list and returned to the caller. If all the list identified by the keys passed in arguments are empty, blPop will block during the specified timeout until an element is pushed to one of those lists. This element will be popped.

Parameters

ARRAY Array containing the keys of the lists
INTEGER Timeout
Or
STRING Key1
STRING Key2
STRING Key3
...
STRING Keyn
INTEGER Timeout

Return value

ARRAY ['listName', 'element']

Example

/* Non blocking feature */
$redis->lPush('key1', 'A');
$redis->del('key2');

$redis->blPop('key1', 'key2', 10); /* ['key1', 'A'] */
/* OR */
$redis->blPop(['key1', 'key2'], 10); /* ['key1', 'A'] */

$redis->brPop('key1', 'key2', 10); /* ['key1', 'A'] */
/* OR */
$redis->brPop(['key1', 'key2'], 10); /* ['key1', 'A'] */

/* Blocking feature */

/* process 1 */
$redis->del('key1');
$redis->blPop('key1', 10);
/* blocking for 10 seconds */

/* process 2 */
$redis->lPush('key1', 'A');

/* process 1 */
/* ['key1', 'A'] is returned*/

bRPopLPush

Description: A blocking version of rPopLPush, with an integral timeout in the third parameter.

Parameters

Key: srckey
Key: dstkey
Long: timeout

Return value

STRING The element that was moved in case of success, FALSE in case of timeout.

lIndex, lGet

Description: Return the specified element of the list stored at the specified key.

0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...

Return FALSE in case of a bad index or a key that doesn't point to a list.

Parameters

key
index

Return value

String the element at this index
Bool FALSE if the key identifies a non-string data type, or no value corresponds to this index in the list Key.

Example

$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lindex('key1', 0); /* 'A' */
$redis->lindex('key1', -1); /* 'C' */
$redis->lindex('key1', 10); /* `FALSE` */

Note: lGet is an alias for lIndex and will be removed in future versions of phpredis.

lInsert

Description: Insert value in the list before or after the pivot value.

The parameter options specify the position of the insert (before or after). If the list didn't exists, or the pivot didn't exists, the value is not inserted.

Parameters

key
position Redis::BEFORE | Redis::AFTER
pivot
value

Return value

The number of the elements in the list, -1 if the pivot didn't exists.

Example

$redis->del('key1');
$redis->lInsert('key1', Redis::AFTER, 'A', 'X'); /* 0 */

$redis->lPush('key1', 'A');
$redis->lPush('key1', 'B');
$redis->lPush('key1', 'C');

$redis->lInsert('key1', Redis::BEFORE, 'C', 'X'); /* 4 */
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'X', 'C'] */

$redis->lInsert('key1', Redis::AFTER, 'C', 'Y'); /* 5 */
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'X', 'C', 'Y'] */

$redis->lInsert('key1', Redis::AFTER, 'W', 'value'); /* -1 */

lPop

Description: Return and remove the first element of the list.

Parameters

key

Return value

STRING if command executed successfully
BOOL FALSE in case of failure (empty list)

Example

$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lPop('key1'); /* key1 => [ 'B', 'C' ] */

lPush

Description: Adds one or more values to the head of a LIST. Creates the list if the key didn't exist. If the key exists and is not a list, FALSE is returned.

Prototype

$redis->lPush($key, $entry [, $entry, $entry]);

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples

$redis->del('key1');
$redis->lPush('key1', 'F'); // returns 1
$redis->lPush('key1', 'E'); // returns 2
$redis->lPush('key1', 'D'); // returns 3
/* key1 now contains: [ 'D', 'E', 'F' ] */

$redis->lPush('key1', 'C', 'B', 'A'); // Returns 6
/* key1 now contains: [ 'A', 'B', 'C', 'D', 'E', 'F' ]

lPushx

Description: Adds the string value to the head (left) of the list if the list exists.

Parameters

key
value String, value to push in key

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples

$redis->del('key1');
$redis->lPushx('key1', 'A'); // returns 0
$redis->lPush('key1', 'A'); // returns 1
$redis->lPushx('key1', 'B'); // returns 2
$redis->lPushx('key1', 'C'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */

lRange, lGetRange

Description: Returns the specified elements of the list stored at the specified key in the range [start, end]. start and stop are interpreted as indices:
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...

Parameters

key
start
end

Return value

Array containing the values in specified range.

Example

$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C');
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'C'] */

Note: lGetRange is an alias for lRange and will be removed in future versions of phpredis.

lRem, lRemove

Description: Removes the first count occurrences of the value element from the list. If count is zero, all the matching elements are removed. If count is negative, elements are removed from tail to head.

Note: The argument order is not the same as in the Redis documentation. This difference is kept for compatibility reasons.

Parameters

key
value
count

Return value

LONG the number of elements to remove
BOOL FALSE if the value identified by key is not a list.

Example

$redis->lPush('key1', 'A');
$redis->lPush('key1', 'B');
$redis->lPush('key1', 'C');
$redis->lPush('key1', 'A');
$redis->lPush('key1', 'A');

$redis->lRange('key1', 0, -1); /* ['A', 'A', 'C', 'B', 'A'] */
$redis->lRem('key1', 'A', 2); /* 2 */
$redis->lRange('key1', 0, -1); /* ['C', 'B', 'A'] */

Note: lRemove is an alias for lRem and will be removed in future versions of phpredis.

lSet

Description: Set the list at index with the new value.

Parameters

key
index
value

Return value

BOOL TRUE if the new value was set. FALSE if the index is out of range, or data type identified by key is not a list.

Example

$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lindex('key1', 0); /* 'A' */
$redis->lSet('key1', 0, 'X');
$redis->lindex('key1', 0); /* 'X' */

lTrim, listTrim

Description: Trims an existing list so that it will contain only a specified range of elements.

Parameters

key
start
stop

Return value

Array
Bool return FALSE if the key identify a non-list value.

Example

$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C');
$redis->lRange('key1', 0, -1); /* ['A', 'B', 'C'] */
$redis->lTrim('key1', 0, 1);
$redis->lRange('key1', 0, -1); /* ['A', 'B'] */

Note: listTrim is an alias for lTrim and will be removed in future versions of phpredis.

rPop

Description: Returns and removes the last element of the list.

Parameters

key

Return value

STRING if command executed successfully
BOOL FALSE in case of failure (empty list)

Example

$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->rPop('key1'); /* key1 => [ 'A', 'B' ] */

rPopLPush

Description: Pops a value from the tail of a list, and pushes it to the front of another list. Also return this value. (redis >= 1.1)

Parameters

Key: srckey
Key: dstkey

Return value

STRING The element that was moved in case of success, FALSE in case of failure.

Example

$redis->del('x', 'y');

$redis->lPush('x', 'abc');
$redis->lPush('x', 'def');
$redis->lPush('y', '123');
$redis->lPush('y', '456');

// move the last of x to the front of y.
var_dump($redis->rPopLPush('x', 'y'));
var_dump($redis->lRange('x', 0, -1));
var_dump($redis->lRange('y', 0, -1));

Output:

string(3) "abc"
array(1) {
  [0]=>
  string(3) "def"
}
array(3) {
  [0]=>
  string(3) "abc"
  [1]=>
  string(3) "456"
  [2]=>
  string(3) "123"
}

rPush

Description: Adds one or more entries to the tail of a LIST. Redis will create the list if it doesn't exist.

Prototype

$redis->rPush($key, $entry [, $entry, $entry]);

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples

$redis->del('key1');
$redis->rPush('key1', 'A');           // returns 1
$redis->rPush('key1', 'B');           // returns 2
$redis->rPush('key1', 'C');           // returns 3
$redis->rPush('key1', 'D', 'E', 'F'); // returns 6
/* key1 now contains: [ 'A', 'B', 'C', 'D', 'E', 'F' ] */

rPushX

Description: Adds the string value to the tail (right) of the list if the list exists. FALSE in case of Failure.

Parameters

key
value String, value to push in key

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples

$redis->del('key1');
$redis->rPushX('key1', 'A'); // returns 0
$redis->rPush('key1', 'A'); // returns 1
$redis->rPushX('key1', 'B'); // returns 2
$redis->rPushX('key1', 'C'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */

lLen, lSize

Description: Returns the size of a list identified by Key.

If the list didn't exist or is empty, the command returns 0. If the data type identified by Key is not a list, the command return FALSE.

Parameters

Key

Return value

LONG The size of the list identified by Key exists.
BOOL FALSE if the data type identified by Key is not list

Example

$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lLen('key1');/* 3 */
$redis->rPop('key1');
$redis->lLen('key1');/* 2 */

Note: lSize is an alias for lLen and will be removed in future versions of phpredis.

Sets

• sAdd - Add one or more members to a set
• sCard, sSize - Get the number of members in a set
• sDiff - Subtract multiple sets
• sDiffStore - Subtract multiple sets and store the resulting set in a key
• sInter - Intersect multiple sets
• sInterStore - Intersect multiple sets and store the resulting set in a key
• sIsMember, sContains - Determine if a given value is a member of a set
• sMembers, sGetMembers - Get all the members in a set
• sMove - Move a member from one set to another
• sPop - Remove and return one or more members of a set at random
• sRandMember - Get one or multiple random members from a set
• sRem, sRemove - Remove one or more members from a set
• sUnion - Add multiple sets
• sUnionStore - Add multiple sets and store the resulting set in a key
• sScan - Scan a set for members

sAdd

Description: Adds a value to the set value stored at key.

Parameters

key
value

Return value

LONG the number of elements added to the set.

Example

$redis->sAdd('key1' , 'member1'); /* 1, 'key1' => {'member1'} */
$redis->sAdd('key1' , 'member2', 'member3'); /* 2, 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sAdd('key1' , 'member2'); /* 0, 'key1' => {'member1', 'member2', 'member3'}*/

sCard, sSize

Description: Returns the cardinality of the set identified by key.

Parameters

key

Return value

LONG the cardinality of the set identified by key, 0 if the set doesn't exist.

Example

$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sCard('key1'); /* 3 */
$redis->sCard('keyX'); /* 0 */

Note: sSize is an alias for sCard and will be removed in future versions of phpredis.

sDiff

Description: Performs the difference between N sets and returns it.

Parameters

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.

Return value

Array of strings: The difference of the first set will all the others.

Example

$redis->del('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s0', '3');
$redis->sAdd('s0', '4');

$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');

var_dump($redis->sDiff('s0', 's1', 's2'));

Return value: all elements of s0 that are neither in s1 nor in s2.

array(2) {
  [0]=>
  string(1) "4"
  [1]=>
  string(1) "2"
}

sDiffStore

Description: Performs the same action as sDiff, but stores the result in the first key

Parameters

Key: dstkey, the key to store the diff into.

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis

Return value

INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.

Example

$redis->del('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s0', '3');
$redis->sAdd('s0', '4');

$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');

var_dump($redis->sDiffStore('dst', 's0', 's1', 's2'));
var_dump($redis->sMembers('dst'));

Return value: the number of elements of s0 that are neither in s1 nor in s2.

int(2)
array(2) {
  [0]=>
  string(1) "4"
  [1]=>
  string(1) "2"
}

sInter

Description: Returns the members of a set resulting from the intersection of all the sets held at the specified keys.

If just a single key is specified, then this command produces the members of this set. If one of the keys is missing, FALSE is returned.

Parameters

key1, key2, keyN: keys identifying the different sets on which we will apply the intersection.

Return value

Array, contain the result of the intersection between those keys. If the intersection between the different sets is empty, the return value will be empty array.

Examples

$redis->sAdd('key1', 'val1');
$redis->sAdd('key1', 'val2');
$redis->sAdd('key1', 'val3');
$redis->sAdd('key1', 'val4');

$redis->sAdd('key2', 'val3');
$redis->sAdd('key2', 'val4');

$redis->sAdd('key3', 'val3');
$redis->sAdd('key3', 'val4');

var_dump($redis->sInter('key1', 'key2', 'key3'));

Output:

array(2) {
  [0]=>
  string(4) "val4"
  [1]=>
  string(4) "val3"
}

sInterStore

Description: Performs a sInter command and stores the result in a new set.

Parameters

Key: dstkey, the key to store the diff into.

Keys: key1, key2... keyN. key1..keyN are intersected as in sInter.

Return value

INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.

Example

$redis->sAdd('key1', 'val1');
$redis->sAdd('key1', 'val2');
$redis->sAdd('key1', 'val3');
$redis->sAdd('key1', 'val4');

$redis->sAdd('key2', 'val3');
$redis->sAdd('key2', 'val4');

$redis->sAdd('key3', 'val3');
$redis->sAdd('key3', 'val4');

var_dump($redis->sInterStore('output', 'key1', 'key2', 'key3'));
var_dump($redis->sMembers('output'));

Output:

int(2)

array(2) {
  [0]=>
  string(4) "val4"
  [1]=>
  string(4) "val3"
}

sIsMember, sContains

Description: Checks if value is a member of the set stored at the key key.

Parameters

key
value

Return value

BOOL TRUE if value is a member of the set at key key, FALSE otherwise.

Example

$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/

$redis->sIsMember('key1', 'member1'); /* TRUE */
$redis->sIsMember('key1', 'memberX'); /* FALSE */

Note: sContains is an alias for sIsMember and will be removed in future versions of phpredis.

sMembers, sGetMembers

Description: Returns the contents of a set.

Parameters

Key: key

Return value

An array of elements, the contents of the set.

Example

$redis->del('s');
$redis->sAdd('s', 'a');
$redis->sAdd('s', 'b');
$redis->sAdd('s', 'a');
$redis->sAdd('s', 'c');
var_dump($redis->sMembers('s'));

Output:

array(3) {
  [0]=>
  string(1) "c"
  [1]=>
  string(1) "a"
  [2]=>
  string(1) "b"
}

The order is random and corresponds to redis' own internal representation of the set structure.

Note: sGetMembers is an alias for sMembers and will be removed in future versions of phpredis.

sMove

Description: Moves the specified member from the set at srcKey to the set at dstKey.

Parameters

srcKey
dstKey
member

Return value

BOOL If the operation is successful, return TRUE. If the srcKey and/or dstKey didn't exist, and/or the member didn't exist in srcKey, FALSE is returned.

Example

$redis->sAdd('key1' , 'member11');
$redis->sAdd('key1' , 'member12');
$redis->sAdd('key1' , 'member13'); /* 'key1' => {'member11', 'member12', 'member13'}*/
$redis->sAdd('key2' , 'member21');
$redis->sAdd('key2' , 'member22'); /* 'key2' => {'member21', 'member22'}*/
$redis->sMove('key1', 'key2', 'member13'); /* 'key1' =>  {'member11', 'member12'} */
					/* 'key2' =>  {'member21', 'member22', 'member13'} */

sPop

Description: Removes and returns a random element from the set value at Key.

Parameters

key
count: Integer, optional

Return value (without count argument)

String "popped" value
Bool FALSE if set identified by key is empty or doesn't exist.

Return value (with count argument)

Array: Member(s) returned or an empty array if the set doesn't exist
Bool: FALSE on error if the key is not a set

Example

$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member3', 'member1', 'member2'}*/
$redis->sPop('key1'); /* 'member1', 'key1' => {'member3', 'member2'} */
$redis->sPop('key1'); /* 'member3', 'key1' => {'member2'} */

/* With count */
$redis->sAdd('key2', 'member1', 'member2', 'member3');
$redis->sPop('key2', 3); /* Will return all members but in no particular order */

sRandMember

Description: Returns a random element from the set value at Key, without removing it.

Parameters

key
count (Integer, optional)

Return value

If no count is provided, a random String value from the set will be returned. If a count is provided, an array of values from the set will be returned. Read about the different ways to use the count here: SRANDMEMBER Bool FALSE if set identified by key is empty or doesn't exist.

Example

$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member3', 'member1', 'member2'}*/

// No count
$redis->sRandMember('key1'); /* 'member1', 'key1' => {'member3', 'member1', 'member2'} */
$redis->sRandMember('key1'); /* 'member3', 'key1' => {'member3', 'member1', 'member2'} */

// With a count
$redis->sRandMember('key1', 3); // Will return an array with all members from the set
$redis->sRandMember('key1', 2); // Will an array with 2 members of the set
$redis->sRandMember('key1', -100); // Will return an array of 100 elements, picked from our set (with dups)
$redis->sRandMember('empty-set', 100); // Will return an empty array
$redis->sRandMember('not-a-set', 100); // Will return FALSE

sRem, sRemove

Description: Removes the specified member from the set value stored at key.

Parameters

key
member

Return value

LONG The number of elements removed from the set.

Example

$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sRem('key1', 'member2', 'member3'); /*return 2. 'key1' => {'member1'} */

Note: sRemove is an alias for sRem and will be removed in future versions of phpredis.

sUnion

Description: Performs the union between N sets and returns it.

Parameters

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.

Return value

Array of strings: The union of all these sets.

Note: sUnion can also take a single array with keys (see example below).

Example

$redis->del('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s1', '3');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
$redis->sAdd('s2', '4');

/* Get the union with variadic arguments */
var_dump($redis->sUnion('s0', 's1', 's2'));

/* Pass a single array */
var_dump($redis->sUnion(['s0', 's1', 's2']);

Return value: all elements that are either in s0 or in s1 or in s2.

array(4) {
  [0]=>
  string(1) "3"
  [1]=>
  string(1) "4"
  [2]=>
  string(1) "1"
  [3]=>
  string(1) "2"
}

sUnionStore

Description: Performs the same action as sUnion, but stores the result in the first key

Parameters

Key: dstkey, the key to store the diff into.

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.

Return value

INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.

Example

$redis->del('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s1', '3');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
$redis->sAdd('s2', '4');

var_dump($redis->sUnionStore('dst', 's0', 's1', 's2'));
var_dump($redis->sMembers('dst'));

Return value: the number of elements that are either in s0 or in s1 or in s2.

int(4)
array(4) {
  [0]=>
  string(1) "3"
  [1]=>
  string(1) "4"
  [2]=>
  string(1) "1"
  [3]=>
  string(1) "2"
}

sScan

Description: Scan a set for members

Parameters

Key: The set to search
iterator: LONG (reference) to the iterator as we go
pattern: String, optional pattern to match against
count: How many members to return at a time (Redis might return a different amount)

Return value

Array, boolean: PHPRedis will return an array of keys or FALSE when we're done iterating

Example

$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY); /* don't return empty results until we're done */
while($arr_mems = $redis->sScan('set', $it, "*pattern*")) {
    foreach($arr_mems as $str_mem) {
        echo "Member: $str_mem\n";
    }
}

$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NORETRY); /* return after each iteration, even if empty */
while(($arr_mems = $redis->sScan('set', $it, "*pattern*"))!==FALSE) {
    if(count($arr_mems) > 0) {
        foreach($arr_mems as $str_mem) {
            echo "Member found: $str_mem\n";
        }
    } else {
        echo "No members in this iteration, iterator value: $it\n";
    }
}

Sorted sets

• bzPop - Block until Redis can pop the highest or lowest scoring member from one or more ZSETs.
• zAdd - Add one or more members to a sorted set or update its score if it already exists
• zCard, zSize - Get the number of members in a sorted set
• zCount - Count the members in a sorted set with scores within the given values
• zIncrBy - Increment the score of a member in a sorted set
• zinterstore, zInter - Intersect multiple sorted sets and store the resulting sorted set in a new key
• zPop - Redis can pop the highest or lowest scoring member from one a ZSET.
• zRange - Return a range of members in a sorted set, by index
• zRangeByScore, zRevRangeByScore - Return a range of members in a sorted set, by score
• zRangeByLex - Return a lexicographical range from members that share the same score
• zRank, zRevRank - Determine the index of a member in a sorted set
• zRem, zDelete, zRemove - Remove one or more members from a sorted set
• zRemRangeByRank, zDeleteRangeByRank - Remove all members in a sorted set within the given indexes
• zRemRangeByScore, zDeleteRangeByScore, zRemoveRangeByScore - Remove all members in a sorted set within the given scores
• zRevRange - Return a range of members in a sorted set, by index, with scores ordered from high to low
• zScore - Get the score associated with the given member in a sorted set
• zunionstore, zUnion - Add multiple sorted sets and store the resulting sorted set in a new key
• zScan - Scan a sorted set for members

bzPop

Description: Block until Redis can pop the highest or lowest scoring members from one or more ZSETs. There are two commands (BZPOPMIN and BZPOPMAX for popping the lowest and highest scoring elements respectively.)

Prototype

$redis->bzPopMin(array $keys, int $timeout): array
$redis->bzPopMax(array $keys, int $timeout): array

$redis->bzPopMin(string $key1, string $key2, ... int $timeout): array
$redis->bzPopMax(string $key1, string $key2, ... int $timeout): array

Return value

ARRAY: Either an array with the key member and score of the highest or lowest element or an empty array if the timeout was reached without an element to pop.

Example

/* Wait up to 5 seconds to pop the *lowest* scoring member from sets `zs1` and `zs2`. */
$redis->bzPopMin(['zs1', 'zs2'], 5);
$redis->bzPopMin('zs1', 'zs2', 5);

/* Wait up to 5 seconds to pop the *highest* scoring member from sets `zs1` and `zs2` */
$redis->bzPopMax(['zs1', 'zs2'], 5);
$redis->bzPopMax('zs1', 'zs2', 5);

Note: Calling these functions with an array of keys or with a variable number of arguments is functionally identical.

zAdd

Description: Add one or more members to a sorted set or update its score if it already exists

Prototype

$redis->zAdd($key, [ $options ,] $score, $value [, $score1, $value1, ...]);

Parameters

key: string options: array (optional) score: double
value: string score1: double value1: string

Return value

Long 1 if the element is added. 0 otherwise.

Example

$redis->zAdd('key', 1, 'val1');
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 5, 'val5');
$redis->zRange('key', 0, -1); // [val0, val1, val5]

// From Redis 3.0.2 it's possible to add options like XX, NX, CH, INCR
$redis->zAdd('key', ['CH'], 5, 'val5', 10, 'val10', 15, 'val15');

zCard, zSize

Description: Returns the cardinality of an ordered set.

Parameters

key

Return value

Long, the set's cardinality

Example

$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zCard('key'); /* 3 */

Note: zSize is an alias for zCard and will be removed in future versions of phpredis.

zCount

Description: Returns the number of elements of the sorted set stored at the specified key which have scores in the range [start,end]. Adding a parenthesis before start or end excludes it from the range. +inf and -inf are also valid limits.

Parameters

key
start: string
end: string

Return value

LONG the size of a corresponding zRangeByScore.

Example

$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zCount('key', 0, 3); /* 2, corresponding to ['val0', 'val2'] */

zIncrBy

Description: Increments the score of a member from a sorted set by a given amount.

Parameters

key
value: (double) value that will be added to the member's score
member

Return value

DOUBLE the new value

Examples

$redis->del('key');
$redis->zIncrBy('key', 2.5, 'member1'); /* key or member1 didn't exist, so member1's score is to 0 before the increment */
					  /* and now has the value 2.5  */
$redis->zIncrBy('key', 1, 'member1'); /* 3.5 */

zinterstore, zInter

Description: Creates an intersection of sorted sets given in second argument. The result of the union will be stored in the sorted set defined by the first argument.

The third optional argument defines weights to apply to the sorted sets in input. In this case, the weights will be multiplied by the score of each element in the sorted set before applying the aggregation. The forth argument defines the AGGREGATE option which specify how the results of the union are aggregated.

Parameters

keyOutput
arrayZSetKeys
arrayWeights
aggregateFunction Either "SUM", "MIN", or "MAX": defines the behaviour to use on duplicate entries during the zinterstore.

Return value

LONG The number of values in the new sorted set.

Example

$redis->del('k1');
$redis->del('k2');
$redis->del('k3');

$redis->del('ko1');
$redis->del('ko2');
$redis->del('ko3');
$redis->del('ko4');

$redis->zAdd('k1', 0, 'val0');
$redis->zAdd('k1', 1, 'val1');
$redis->zAdd('k1', 3, 'val3');

$redis->zAdd('k2', 2, 'val1');
$redis->zAdd('k2', 3, 'val3');

$redis->zinterstore('ko1', ['k1', 'k2']); 				/* 2, 'ko1' => ['val1', 'val3'] */
$redis->zinterstore('ko2', ['k1', 'k2'], [1, 1]); 	/* 2, 'ko2' => ['val1', 'val3'] */

/* Weighted zinterstore */
$redis->zinterstore('ko3', ['k1', 'k2'], [1, 5], 'min'); /* 2, 'ko3' => ['val1', 'val3'] */
$redis->zinterstore('ko4', ['k1', 'k2'], [1, 5], 'max'); /* 2, 'ko4' => ['val3', 'val1'] */

Note: zInter is an alias for zinterstore and will be removed in future versions of phpredis.

zPop

Description: Can pop the highest or lowest scoring members from one ZSETs. There are two commands (ZPOPMIN and ZPOPMAX for popping the lowest and highest scoring elements respectively.)

Prototype

$redis->zPopMin(string $key, int $count): array
$redis->zPopMax(string $key, int $count): array

$redis->zPopMin(string $key, int $count): array
$redis->zPopMax(string $key, int $count): array

Return value

ARRAY: Either an array with the key member and score of the highest or lowest element or an empty array if there is no element available.

Example

/* Pop the *lowest* scoring member from set `zs1`. */
$redis->zPopMin('zs1', 5);

/* Pop the *highest* scoring member from set `zs1`. */
$redis->zPopMax('zs1', 5);

zRange

Description: Returns a range of elements from the ordered set stored at the specified key, with values in the range [start, end].

Start and stop are interpreted as zero-based indices:
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...

Parameters

key start: long
end: long
withscores: bool = false

Return value

Array containing the values in specified range.

Example

$redis->zAdd('key1', 0, 'val0');
$redis->zAdd('key1', 2, 'val2');
$redis->zAdd('key1', 10, 'val10');
$redis->zRange('key1', 0, -1); /* ['val0', 'val2', 'val10'] */

// with scores
$redis->zRange('key1', 0, -1, true); /* ['val0' => 0, 'val2' => 2, 'val10' => 10] */

zRangeByScore, zRevRangeByScore

Description: Returns the elements of the sorted set stored at the specified key which have scores in the range [start,end]. Adding a parenthesis before start or end excludes it from the range. +inf and -inf are also valid limits. zRevRangeByScore returns the same items in reverse order, when the start and end parameters are swapped.

Parameters

key
start: string
end: string
options: array

Two options are available: withscores => TRUE, and limit => [$offset, $count]

Return value

Array containing the values in specified range.

Example

$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRangeByScore('key', 0, 3); /* ['val0', 'val2'] */
$redis->zRangeByScore('key', 0, 3, ['withscores' => TRUE]); /* ['val0' => 0, 'val2' => 2] */
$redis->zRangeByScore('key', 0, 3, ['limit' => [1, 1]]); /* ['val2'] */
$redis->zRangeByScore('key', 0, 3, ['withscores' => TRUE, 'limit' => [1, 1]]); /* ['val2' => 2] */
$redis->zRangeByScore('key', '-inf', '+inf', ['withscores' => TRUE]); /* ['val0' => 0, 'val2' => 2, 'val10' => 10] */

zRangeByLex

Description: Returns a lexicographical range of members in a sorted set, assuming the members have the same score. The min and max values are required to start with '(' (exclusive), '[' (inclusive), or be exactly the values '-' (negative inf) or '+' (positive inf). The command must be called with either three or five arguments or will return FALSE.

Parameters

key: The ZSET you wish to run against
min: The minimum alphanumeric value you wish to get
max: The maximum alphanumeric value you wish to get
offset: Optional argument if you wish to start somewhere other than the first element.
limit: Optional argument if you wish to limit the number of elements returned.

Return value

Array containing the values in the specified range.

Example

foreach(['a','b','c','d','e','f','g'] as $c)
    $redis->zAdd('key',0,$c);

$redis->zRangeByLex('key','-','[c') /* ['a','b','c']; */
$redis->zRangeByLex('key','-','(c') /* ['a','b'] */
$redis->zRangeByLex('key','-','[c',1,2) /* ['b','c'] */

zRank, zRevRank

Description: Returns the rank of a given member in the specified sorted set, starting at 0 for the item with the smallest score. zRevRank starts at 0 for the item with the largest score.

Parameters

key
member

Return value

Long, the item's score.

Example

$redis->del('z');
$redis->zAdd('key', 1, 'one');
$redis->zAdd('key', 2, 'two');
$redis->zRank('key', 'one'); /* 0 */
$redis->zRank('key', 'two'); /* 1 */
$redis->zRevRank('key', 'one'); /* 1 */
$redis->zRevRank('key', 'two'); /* 0 */

zRem, zDelete, zRemove

Description: Delete one or more members from a sorted set.

Prototype

$redis->zRem($key, $member [, $member ...]);

Return value

LONG: The number of members deleted.

Example

$redis->zAdd('key', 0, 'val0', 1, 'val1', 2, 'val2');
$redis->zRem('key', 'val0', 'val1', 'val2'); // Returns: 3

Note: zDelete and zRemove are an alias for zRem and will be removed in future versions of phpredis.

zRemRangeByRank, zDeleteRangeByRank

Description: Deletes the elements of the sorted set stored at the specified key which have rank in the range [start,end].

Parameters

key
start: LONG
end: LONG

Return value

LONG The number of values deleted from the sorted set

Example

$redis->zAdd('key', 1, 'one');
$redis->zAdd('key', 2, 'two');
$redis->zAdd('key', 3, 'three');
$redis->zRemRangeByRank('key', 0, 1); /* 2 */
$redis->zRange('key', 0, -1, ['withscores' => TRUE]); /* ['three' => 3] */

Note: zDeleteRangeByRank is an alias for zRemRangeByRank and will be removed in future versions of phpredis.

zRemRangeByScore, zDeleteRangeByScore, zRemoveRangeByScore

Description: Deletes the elements of the sorted set stored at the specified key which have scores in the range [start,end].

Parameters

key
start: double or "+inf" or "-inf" string
end: double or "+inf" or "-inf" string

Return value

LONG The number of values deleted from the sorted set

Example

$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRemRangeByScore('key', 0, 3); /* 2 */

Note: zDeleteRangeByScore and zRemoveRangeByScore are an alias for zRemRangeByScore and will be removed in future versions of phpredis.

zRevRange

Description: Returns the elements of the sorted set stored at the specified key in the range [start, end] in reverse order. start and stop are interpreted as zero-based indices:
0 the first element, 1 the second ...
-1 the last element, -2 the penultimate ...

Parameters

key
start: long
end: long
withscores: bool = false

Return value

Array containing the values in specified range.

Example

$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRevRange('key', 0, -1); /* ['val10', 'val2', 'val0'] */

// with scores
$redis->zRevRange('key', 0, -1, true); /* ['val10' => 10, 'val2' => 2, 'val0' => 0] */

zScore

Description: Returns the score of a given member in the specified sorted set.

Parameters

key
member

Return value

Double or FALSE when the value is not found

Example

$redis->zAdd('key', 2.5, 'val2');
$redis->zScore('key', 'val2'); /* 2.5 */

zunionstore, zUnion

Description: Creates an union of sorted sets given in second argument. The result of the union will be stored in the sorted set defined by the first argument.

The third optional argument defines weights to apply to the sorted sets in input. In this case, the weights will be multiplied by the score of each element in the sorted set before applying the aggregation. The forth argument defines the AGGREGATE option which specify how the results of the union are aggregated.

Parameters

keyOutput
arrayZSetKeys
arrayWeights
aggregateFunction Either "SUM", "MIN", or "MAX": defines the behaviour to use on duplicate entries during the zunionstore.

Return value

LONG The number of values in the new sorted set.

Example

$redis->del('k1');
$redis->del('k2');
$redis->del('k3');
$redis->del('ko1');
$redis->del('ko2');
$redis->del('ko3');

$redis->zAdd('k1', 0, 'val0');
$redis->zAdd('k1', 1, 'val1');

$redis->zAdd('k2', 2, 'val2');
$redis->zAdd('k2', 3, 'val3');

$redis->zunionstore('ko1', ['k1', 'k2']); /* 4, 'ko1' => ['val0', 'val1', 'val2', 'val3'] */

/* Weighted zunionstore */
$redis->zunionstore('ko2', ['k1', 'k2'], [1, 1]); /* 4, 'ko2' => ['val0', 'val1', 'val2', 'val3'] */
$redis->zunionstore('ko3', ['k1', 'k2'], [5, 1]); /* 4, 'ko3' => ['val0', 'val2', 'val3', 'val1'] */