在类中调用函数时触发事件 [英] Trigger an event when a function is called in a class

问题描述

例如：

可以在PHP中触发一个事件，当类中的函数被调用时， p>

Example:

<?php
    class A {
        function xxx() {
            //this function will be called everytime I call another function in this class  
        }

        public static function b() {
            return 'Hello Stackoverflow!';
        }

        public static function c() {
            //I also want this function to trigger the event!
        }
    }

    echo A::b();
?>

推荐答案

AFAIK没有本地语言结构。如果您需要进行调试，建议您深入了解xdebug扩展程序，特别是功能跟踪（真棒！:)

AFAIK there are no native language constructs for this. If you need it for debugging purposes I would advice you to have deeper look into the xdebug extension especially function traces (awesome! :)

另一个想法是实现 __ call（） ，并包装所有公共方法。但是，这需要更改代码并具有其他副作用：

Another idea would be to implement __call() in your class and wrap all public methods. But this requires to change the code and has other side effects:

（简化示例）

class Test {

    protected $listeners;

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

    private function a() {
        echo 'something';
    }

    private function b() {
        echo 'something else';
    }

    public function __call($fname, $args) {
        call_user_func_array(array($this, $fname), $args);
        foreach($this->listeners as $listener) {
            $listener->notify('fname was called');
        }
    }

    public function addListener(Listener $listener) {
        $this->listeners[]= $listener;
    }
}

。

 class Listener {

     public function notify($message) {
         echo $message;
     }

 }

示例：

 $t = new Test();
 $l = new Listener();
 $t->addListener($l);

 $t->a();

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