Closure::call

(PHP 7, PHP 8)

Closure::call — Binds and calls the closure

Description

public Closure::call(object $newThis, mixed ...$args): mixed

Temporarily binds the closure to newThis, and calls it with any given parameters.

Parameters

newThis: The object to bind the closure to for the duration of the call.
args: Zero or more parameters, which will be given as parameters to the closure.

Return Values

Returns the return value of the closure.

Examples

Example #1 Closure::call() example

<?php
class Value {
    protected $value;

    public function __construct($value) {
        $this->value = $value;
    }

    public function getValue() {
        return $this->value;
    }
}

$three = new Value(3);
$four = new Value(4);

$closure = function ($delta) { var_dump($this->getValue() + $delta); };
$closure->call($three, 4);
$closure->call($four, 4);
?>

The above example will output:

int(7)
int(8)

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User Contributed Notes 2 notes

down

php-net at gander dot pl ¶

3 years ago

You can also access private data:

<?php
class Value {
    private $value;

    public function __construct($value) {
        $this->value = $value;
    }
}

$foo = new Value('Foo');
$bar = new Value('Bar');

$closure = function () { var_dump($this->value); };
$closure->call($foo);
$closure->call($bar);
?>

Output:
string(3) "Foo"
string(3) "Bar"

down

sergey dot nevmerzhitsky at gmail dot com ¶

8 years ago

Prior PHP 7.0 you can use this code:

<?php
$cl = function($add) { return $this->a + $add; };

$cl->bindTo($newthis);
return call_user_func_array($cl, [10]);
?>

But this bind the closure permanently! Also read the article for Closure::bindTo() about binding closures from static context.

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