A set of useful Laravel collection macros
This repository contains some useful collection macros.
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Installation
You can pull in the package via composer:
composer require spatie/laravel-collection-macros
The package will automatically register itself.
Macros
afteratbeforecatchchunkBycollectByeachConsextractfilterMapfirstOrFailfromPairsglobgroupByModelheadifAnyifEmptynonepaginateparallelMappluckToArrayprioritizerotatesectionBysimplePaginatesliceBeforetailtrytoPairstransposevalidatewithSize
after
Get the next item from the collection.
$collection = collect([1,2,3]);
$currentItem = 2;
$currentItem = $collection->after($currentItem); // return 3;
$collection->after($currentItem); // return null;
$currentItem = $collection->after(function($item) {
return $item > 1;
}); // return 3;
You can also pass a second parameter to be used as a fallback.
$collection = collect([1,2,3]);
$currentItem = 3;
$collection->after($currentItem, $collection->first()); // return 1;
at
Retrieve an item at an index.
$data = new Collection([1, 2, 3]);
$data->at(0); // 1
$data->at(1); // 2
$data->at(-1); // 3
second
Retrieve item at the second index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->second(); // 2
third
Retrieve item at the third index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->third(); // 3
fourth
Retrieve item at the fourth index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->fourth(); // 4
fifth
Retrieve item at the fifth index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->fifth(); // 5
sixth
Retrieve item at the sixth index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->sixth(); // 6
seventh
Retrieve item at the seventh index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->seventh(); // 7
eighth
Retrieve item at the eighth index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->eighth(); // 8
ninth
Retrieve item at the ninth index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->ninth(); // 9
tenth
Retrieve item at the tenth index.
$data = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$data->tenth(); // 10
before
Get the previous item from the collection.
$collection = collect([1,2,3]);
$currentItem = 2;
$currentItem = $collection->before($currentItem); // return 1;
$collection->before($currentItem); // return null;
$currentItem = $collection->before(function($item) {
return $item > 2;
}); // return 2;
You can also pass a second parameter to be used as a fallback.
$collection = collect([1,2,3]);
$currentItem = 1;
$collection->before($currentItem, $collection->last()); // return 3;
catch
See Try
chunkBy
Chunks the values from a collection into groups as long the given callback is true. If the optional parameter $preserveKeys as true is passed, it will preserve the original keys.
collect(['A', 'A', 'B', 'A'])->chunkBy(function($item) {
return $item == 'A';
}); // return Collection([['A', 'A'],['B'], ['A']])
collectBy
Get an item at a given key, and collect it.
$collection = collect([
'foo' => [1, 2, 3],
'bar' => [4, 5, 6],
]);
$collection->collectBy('foo'); // Collection([1, 2, 3])
You can also pass a second parameter to be used as a fallback.
$collection = collect([
'foo' => [1, 2, 3],
'bar' => [4, 5, 6],
]);
$collection->collectBy('baz', ['Nope']); // Collection(['Nope'])
eachCons
Get the following consecutive neighbours in a collection from a given chunk size. If the optional parameter $preserveKeys as true is passed, it will preserve the original keys.
collect([1, 2, 3, 4])->eachCons(2); // return collect([[1, 2], [2, 3], [3, 4]])
extract
Extract keys from a collection. This is very similar to only, with two key differences:
extractreturns an array of values, not an associative array- If a value doesn't exist, it will fill the value with
nullinstead of omitting it
extract is useful when using PHP 7.1 short list() syntax.
[$name, $role] = collect($user)->extract('name', 'role.name');
filterMap
Map a collection and remove falsy values in one go.
$collection = collect([1, 2, 3, 4, 5, 6])->filterMap(function ($number) {
$quotient = $number / 3;
return is_integer($quotient) ? $quotient : null;
});
$collection->toArray(); // returns [1, 2]
firstOrFail
Get the first item. Throws Spatie\CollectionMacros\Exceptions\CollectionItemNotFound if the item was not found.
$collection = collect([1, 2, 3, 4, 5, 6])->firstOrFail();
$collection->toArray(); // returns [1]
collect([])->firstOrFail(); // throws Spatie\CollectionMacros\Exceptions\CollectionItemNotFound
fromPairs
Transform a collection into an associative array form collection item.
$collection = collect([['a', 'b'], ['c', 'd'], ['e', 'f']])->fromPairs();
$collection->toArray(); // returns ['a' => 'b', 'c' => 'd', 'e' => 'f']
glob
Returns a collection of a glob() result.
Collection::glob('config/*.php');
groupByModel
Similar to groupBy, but groups the collection by an Eloquent model. Since the key is an object instead of an integer or string, the results are divided into separate arrays.
$posts->groupByModel('category');
// [
// [$categoryA, [/*...$posts*/]],
// [$categoryB, [/*...$posts*/]],
// ];
Full signature: groupByModel($callback, $preserveKeys, $modelKey, $itemsKey)
head
Retrieves first item from the collection.
$collection = collect([1,2,3]);
$collection->head(); // return 1
$collection = collect([]);
$collection->head(); // return null
ifAny
Executes the passed callable if the collection isn't empty. The entire collection will be returned.
collect()->ifAny(function(Collection $collection) { // empty collection so this won't get called
echo 'Hello';
});
collect([1, 2, 3])->ifAny(function(Collection $collection) { // non-empty collection so this will get called
echo 'Hello';
});
ifEmpty
Executes the passed callable if the collection is empty. The entire collection will be returned.
collect()->ifEmpty(function(Collection $collection) { // empty collection so this will called
echo 'Hello';
});
collect([1, 2, 3])->ifEmpty(function(Collection $collection) { // non-empty collection so this won't get called
echo 'Hello';
});
none
Checks whether a collection doesn't contain any occurrences of a given item, key-value pair, or passing truth test. The function accepts the same parameters as the contains collection method.
collect(['foo'])->none('bar'); // returns true
collect(['foo'])->none('foo'); // returns false
collect([['name' => 'foo']])->none('name', 'bar'); // returns true
collect([['name' => 'foo']])->none('name', 'foo'); // returns false
collect(['name' => 'foo'])->none(function ($key, $value) {
return $key === 'name' && $value === 'bar';
}); // returns true
paginate
Create a LengthAwarePaginator instance for the items in the collection.
collect($posts)->paginate(5);
This paginates the contents of $posts with 5 items per page. paginate accepts quite some options, head over to the Laravel docs for an in-depth guide.
paginate(int $perPage = 15, string $pageName = 'page', int $page = null, int $total = null, array $options = [])
parallelMap
Identical to map but each item in the collection will be processed in parallel. Before using this macro you should pull in the amphp/parallel-functions package.
composer require amphp/parallel-functions
Be aware that under the hood some overhead is introduced to make the parallel processing possible. When your $callable is only a simple operation it's probably better to use map instead. Also keep in mind that parallelMap can be memory intensive.
$pageSources = collect($urls)->parallelMap(function($url) {
return file_get_contents($url);
});
The page contents of the given $urls will be fetched at the same time. The underlying amp sets a maximum of 32 concurrent processes by default.
There is a second (optional) parameter, through which you can define a custom parallel processing pool. It looks like this:
use Amp\Parallel\Worker\DefaultPool;
$pool = new DefaultPool(8);
$pageSources = collect($urls)->parallelMap(function($url) {
return file_get_contents($url);
}, $pool);
If you don't need to extend the worker pool, or can't be bothered creating the new pool yourself; you can use an integer the the number of workers you'd like to use. A new DefaultPool will be created for you:
$pageSources = collect($urls)->parallelMap(function($url) {
return file_get_contents($url);
}, 8);
This helps to reduce the memory overhead, as the default worker pool limit is 32 (as defined in amphp/parallel). Using fewer worker threads can significantly reduce memory and processing overhead, in many cases. Benchmark and customise the worker thread limit to suit your particular use-case.
pluckToArray
Returns array of values of a given key.
$collection = collect([
['a' => 1, 'b' => 10],
['a' => 2, 'b' => 20],
['a' => 3, 'b' => 30]
]);
$collection->pluckToArray('a'); // returns [1, 2, 3]
prioritize
Move elements to the start of the collection.
$collection = collect([
['id' => 1],
['id' => 2],
['id' => 3],
]);
$collection
->prioritize(function(array $item) {
return $item['id'] === 2;
})
->pluck('id')
->toArray(); // returns [2, 1, 3]
rotate
Rotate the items in the collection with given offset
$collection = collect([1, 2, 3, 4, 5, 6]);
$rotate = $collection->rotate(1);
$rotate->toArray();
// [2, 3, 4, 5, 6, 1]
sectionBy
Splits a collection into sections grouped by a given key. Similar to groupBy but respects the order of the items in the collection and reuses existing keys.
$collection = collect([
['name' => 'Lesson 1', 'module' => 'Basics'],
['name' => 'Lesson 2', 'module' => 'Basics'],
['name' => 'Lesson 3', 'module' => 'Advanced'],
['name' => 'Lesson 4', 'module' => 'Advanced'],
['name' => 'Lesson 5', 'module' => 'Basics'],
]);
$collection->sectionBy('module');
// [
// ['Basics', [
// ['name' => 'Lesson 1', 'module' => 'Basics'],
// ['name' => 'Lesson 2', 'module' => 'Basics'],
// ]],
// ['Advanced', [
// ['name' => 'Lesson 3', 'module' => 'Advanced'],
// ['name' => 'Lesson 4', 'module' => 'Advanced'],
// ]],
// ['Basics', [
// ['name' => 'Lesson 5', 'module' => 'Basics'],
// ]],
// ];
Full signature: sectionBy($callback, $preserveKeys, $sectionKey, $itemsKey)
simplePaginate
Create a Paginator instance for the items in the collection.
collect($posts)->simplePaginate(5);
This paginates the contents of $posts with 5 items per page. simplePaginate accepts quite some options, head over to the Laravel docs for an in-depth guide.
simplePaginate(int $perPage = 15, string $pageName = 'page', int $page = null, int $total = null, array $options = [])
For a in-depth guide on pagination, check out the Laravel docs.
sliceBefore
Slice the values out from a collection before the given callback is true. If the optional parameter $preserveKeys as true is passed, it will preserve the original keys.
collect([20, 51, 10, 50, 66])->sliceBefore(function($item) {
return $item > 50;
}); // return collect([[20],[51, 10, 50], [66])
tail
Extract the tail from a collection. So everything except the first element. It's a shorthand for slice(1)->values(), but nevertheless very handy. If the optional parameter $preserveKeys as true is passed, it will preserve the keys and fallback to slice(1).
collect([1, 2, 3])->tail(); // return collect([2, 3])
toPairs
Transform a collection into an array with pairs.
$collection = collect(['a' => 'b', 'c' => 'd', 'e' => 'f'])->toPairs();
$collection->toArray(); // returns ['a', 'b'], ['c', 'd'], ['e', 'f']
transpose
The goal of transpose is to rotate a multidimensional array, turning the rows into columns and the columns into rows.
collect([
['Jane', 'Bob', 'Mary'],
['[email protected]', '[email protected]', '[email protected]'],
['Doctor', 'Plumber', 'Dentist'],
])->transpose()->toArray();
// [
// ['Jane', '[email protected]', 'Doctor'],
// ['Bob', '[email protected]', 'Plumber'],
// ['Mary', '[email protected]', 'Dentist'],
// ]
try
If any of the methods between try and catch throw an exception, then the exception can be handled in catch.
collect(['a', 'b', 'c', 1, 2, 3])
->try()
->map(fn ($letter) => strtoupper($letter))
->each(function() {
throw new Exception('Explosions in the sky');
})
->catch(function (Exception $exception) {
// handle exception here
})
->map(function() {
// further operations can be done, if the exception wasn't rethrow in the `catch`
});
While the methods are named try/catch for familiarity with PHP, the collection itself behaves more like a database transaction. So when an exception is thrown, the original collection (before the try) is returned.
You may gain access to the collection within catch by adding a second parameter to your handler. You may also manipulate the collection within catch by returning a value.
$collection = collect(['a', 'b', 'c', 1, 2, 3])
->try()
->map(function ($item) {
throw new Exception();
})
->catch(function (Exception $exception, $collection) {
return collect(['d', 'e', 'f']);
})
->map(function ($item) {
return strtoupper($item);
});
// ['D', 'E', 'F']
validate
Returns true if the given $callback returns true for every item. If $callback is a string or an array, regard it as a validation rule.
collect(['foo', 'foo'])->validate(function ($item) {
return $item === 'foo';
}); // returns true
collect(['[email protected]', 'bla'])->validate('email'); // returns false
collect(['[email protected]', '[email protected]'])->validate('email'); // returns true
withSize
Create a new collection with the specified amount of items.
Collection::withSize(1)->toArray(); // return [1];
Collection::withSize(5)->toArray(); // return [1,2,3,4,5];
Changelog
Please see CHANGELOG for more information what has changed recently.
Testing
$ composer test
Contributing
Please see CONTRIBUTING for details.
Security
If you discover any security related issues, please email [email protected] instead of using the issue tracker.
Credits
About Spatie
Spatie is a webdesign agency based in Antwerp, Belgium. You'll find an overview of all our open source projects on our website.
License
The MIT License (MIT). Please see License File for more information.
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