Closure::call

(PHP 7, PHP 8)

Closure::call — 绑定并调用闭包

说明

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

暂时将闭包绑定到 newThis，并使用任意给定的参数调用它。

参数

newThis: 在调用期间将闭包绑定到 object。
args: 零个或多个参数，他们将作为参数传递给闭包。

返回值

返回闭包的返回值。

示例

示例 #1 Closure::call() 示例

<?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);
?>

以上示例会输出：

int(7)
int(8)

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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.