It seems that the result of the "fromCallable" behaves a little bit different then an original Lambda function.
class A {
private $name;
public function __construct($name)
{
$this->name = $name;
}
}
// test callable
function getName()
{
return $this->name;
}
$bob = new A("Bob");
$cl1 = Closure::fromCallable("getName");
$cl1 = $cl1->bindTo($bob, 'A');
//This will retrieve: Uncaught Error: Cannot access private property A::$name
$result = $cl1();
echo $result;
//But for a Lambda function
$cl2 = function() {
return $this->name;
};
$cl2 = $cl2->bindTo($bob, 'A');
$result = $cl2();
// This will print Bob
echo $result;
Closure::fromCallable
(PHP 7 >= 7.1.0)
Closure::fromCallable — Wandelt ein Callable in eine Closure um
Beschreibung
Erzeugt aus dem angegebenen Callback eine neue
anonyme Funktion im aktuellen
Geltungsbereich und gibt diese zurück. Diese Methode prüft, ob der
Callback im aktuellen Bereich aufrufbar ist und
wirft einen TypeError, wenn dies nicht der Fall ist.
Hinweis:
Seit PHP 8.1.0 hat Callback-Funktionen als Objekte erster Klasse die gleiche Semantik wie diese Methode.
Parameter-Liste
-
callback -
Das Callable, das umgewandelt werden soll.
add a note
User Contributed Notes 3 notes
igorchernin at yahoo dot com ¶
7 years ago
4-lom at live dot de ¶
6 years ago
Sadly, your comparison is incorrect.
// The equivalent to
$cl1 = Closure::fromCallable("getName");
$cl1 = $cl1->bindTo($bob, 'A');
// is most likely this
$cl2 = function() {
return call_user_func_array("getName", func_get_args());
};
$cl2 = $cl2->bindTo($bob, 'A');
Executing one or the other Closure should result in the same access violation error you already postet.
----
A simple PHP 7.0 polyfill could look like this:
----
namespace YourPackage;
/**
* Class Closure
*
* @see \Closure
*/
class Closure
{
/**
* @see \Closure::fromCallable()
* @param callable $callable
* @return \Closure
*/
public static function fromCallable(callable $callable)
{
// In case we've got it native, let's use that native one!
if(method_exists(\Closure::class, 'fromCallable')) {
return \Closure::fromCallable($callable);
}
return function () use ($callable) {
return call_user_func_array($callable, func_get_args());
};
}
}
nakerlund at gmail dot com ¶
6 years ago
I have two points:
It is possible to use Closure::fromCallable to convert private/protected methods to closures and use them outside the class.
Closure::fromCallable accepts late dynamic bindings using the keyword static if provided as a string.
My code below demonstrate how a private static method can be used as a callback in a function outside the class.
<?php
function myCustomMapper ( Callable $callable, string $str ): string {
return join(' ', array_map( $callable, explode(' ', $str) ) );
}
class MyClass {
public static function mapUCFirst ( string $str ): string {
$privateMethod = 'static::mapper';
$mapper = Closure::fromCallable( $privateMethod );
return myCustomMapper( $mapper, $str );
}
private static function mapper ( string $str ): string {
return ucfirst( $str );
}
}
echo MyClass::mapUCFirst('four little uncapitalized words');
// Prints: Four Little Uncapitalized Words
?>
