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Closure::call

(PHP 7, PHP 8)

Closure::callBinds and calls the closure

Beschreibung

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

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

Parameter-Liste

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.

Rückgabewerte

Returns the return value of the closure.

Beispiele

Beispiel #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);
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

int(7)
int(8)
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User Contributed Notes 2 notes

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4
sergey dot nevmerzhitsky at gmail dot com
6 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.
up
1
php-net at gander dot pl
1 year 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"
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