then(function ($string) { echo $string; // should print "hello" }); ">

use Jviguy\Promises\Promise;
class A {
    /**
    * @return Promise
   
     - a promise containing a string
   
    */
    public static function foo(): Promise {
        return new Promise(fn() => "hello");
    }
}

A::foo()->then(function ($string) {
    echo $string; // should print "hello"
});

catch(function (Exception $error) { echo "an error has a occurred message: "; echo $error->getMessage(); }); ">

use Jviguy\Promises\Promise;
class A {
    /**
    * @return Promise
   
     - a promise containing a string
   
    */
    public static function foo(): Promise {
        return new Promise(fn() => throw new Exception("testing exception"));
    }
}

A::foo()->catch(function (Exception $error) {
    echo "an error has a occurred message: ";
    echo $error->getMessage();
});