利用反射给类中方法加钩子

有一个类如下所示:

 

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class Test
{
    private $name = 'ok';
 
    public function __beforePrintname()
    {
        echo '调用方法前';
    }
 
    public function printName()
    {
        echo 'ok';
    }
 
    public function __afterPrintname()
    {
        echo '调用方法后';
    }
}

  

我们希望在实例化后调用printName方法前能调用__beforePrintname,调用printName后能调用__afterPrintname;给这个方法前后都加一个钩子方法

我们可以使用反射来实现,代码如下:

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class Proxy
{
    private $arrObject = [];
 
    public function __construct($obj)
    {
        $this->arrObject[] = new $obj();
    }
 
    public function __call($name, $arguments)
    {
        foreach ($this->arrObject as $obj) {
            $ref = new ReflectionClass($obj);
            if ($method = $ref->getMethod($name)) {
                if ($method->isPublic()) {
 
                    // 调用方法前
                    $beforeMethodName = '__before' . $name;
                    if ($ref->hasMethod($beforeMethodName)) {
                        $beforeMethod = $ref->getMethod($beforeMethodName);
                        if ($beforeMethod->isPublic()) {
                            $beforeMethod->invoke($obj, $arguments);
                        }
                    }
 
                    // 调用方法
                    $method->invoke($obj, $arguments);
 
                    // 调用方法后
                    $afterMethodName = '__after' . $name;
                    if ($ref->hasMethod($afterMethodName)) {
                        $afterMethod = $ref->getMethod($afterMethodName);
                        if ($afterMethod->isPublic()) {
                            $afterMethod->invoke($obj, $arguments);
                        }
                    }
                }
            }
        }
    }
}

  

测试:

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$test = new Proxy('Test');
$test->printName();

  

输出:

调用方法前ok调用方法后

posted @   rorshach  阅读(522)  评论(0编辑  收藏  举报
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