PHP7之Closure::call javascript closure need for closure google closur
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2022-04-06 18:37:33
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Closure 类:匿名函数(在 PHP 5.3 中被引入)会产生这个类型的对象。
可将该类绑定到类或者对象上,即将自定义的方法动态添加到类或者对象上
php7之前使用的方法
Closure::bind :复制一个闭包,绑定指定的$this对象和类作用域。这个方法是 Closure::bindTo() 的静态版本
Closure::bindTo :复制当前闭包对象,绑定指定的$this对象和类作用域。创建并返回一个 匿名函数, 它与当前对象的函数体相同、绑定了同样变量,但可以绑定不同的对象,也可以绑定新的类作用域。
php7添加
- Closure::call() : 方法被添加作为临时绑定的对象范围,以封闭并简便调用它的方法。它的性能相比PHP5.6 bindTo要快得多。
//bind.php/**
* Created by PhpStorm.
* User: bee
* Date: 2016/4/24
* Time: 22:35
*/classA {privatestatic$sta = 1;
private$com = 2;
}
$cl1 = staticfunction() {return A::$sta;
};
$cl2 = function() {return$this->com;
};
$bcl1 = Closure::bind($cl1, null, 'A');
$bcl2 = Closure::bind($cl2, new A(), 'A');
echo$bcl1(), "\n";
echo$bcl2(), "\n";
//bindTo.php/**
* Created by PhpStorm.
* User: bee
* Date: 2016/4/24
* Time: 22:35
*/classA {function__construct($val) {$this->val = $val;
}
functiongetClosure() {//returns closure bound to this object and scopereturnfunction() {return$this->val; };
}
}
$ob1 = new A(1);
$ob2 = new A(2);
$cl = $ob1->getClosure();
echo$cl(), "\n";
$add = function(){return$this->val+1;
};
$cl = $add->bindTo($ob2);
//与call相比,需要增加()方可被调用echo$cl(), "\n";
//call.php/**
* Created by PhpStorm.
* User: bee
* Date: 2016/4/24
* Time: 22:35
*/classValue {protected$value;
publicfunction__construct($value) {$this->value = $value;
}
publicfunctiongetValue() {return$this->value;
}
}
$three = new Value(3);
$four = new Value(4);
$closure = function($delta) {return$this->getValue() + $delta; };
//可直接调用,不用在后面增加()echo$closure->call($three, 3);
echo$closure->call($four, 4);
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以上就介绍了PHP7之Closure::call,包括了closure,php7方面的内容,希望对PHP教程有兴趣的朋友有所帮助。
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