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。

范例

Example #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);
?>

以上例程会输出：

int(7)
int(8)

User Contributed Notes

php-net at gander dot pl 19-Aug-2021 10:23


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"

sergey dot nevmerzhitsky at gmail dot com 16-Sep-2016 10:12


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.