How to Implement event listening for method calls of a defined class in event-php

{Code ...} if you want to implement the implementation without modifying the existing call Process Code, define the class method (here is & #039; mycall & #039 ;) event listening, such as intercepting and modifying the return of mycall. I know that you can solve the problem through a similar method of the packaging class, but if you do not want to modify the existing call process...

class a{    function mycall($var){        return 'hello:'.$var;    }}//invoke$aobj = new a();echo $aobj->mycall('abc');

To implementDo not modify the existing call ProcessIn the case of code, to listen to events that have defined class methods (here is 'mycall'), suchIntercepts and modifies the return of mycall..

I know that you can solve the problem through a similar method of the packaging class. But if you don't want to modify the existing calling process, just add code before or after the class definition to solve the problem? In addition, the system environment is 5.3, so traits cannot be used for the time being. Is there any work und?

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class a{    function mycall($var){        return 'hello:'.$var;    }}//invoke$aobj = new a();echo $aobj->mycall('abc');

To implementDo not modify the existing call ProcessIn the case of code, to listen to events that have defined class methods (here is 'mycall'), suchIntercepts and modifies the return of mycall..

I know that you can solve the problem through a similar method of the packaging class. But if you don't want to modify the existing calling process, just add code before or after the class definition to solve the problem? In addition, the system environment is 5.3, so traits cannot be used for the time being. Is there any work und?

So?

trait T {    private function mycall($var){        return 'hello:'.str_pad($var, 4, '__', STR_PAD_LEFT);    }}//invokeclass  A{    use T {        mycall as traitmycall;    }    public function mycall($val)    {        return $this->traitmycall($val);    }}$obj = new A();echo $obj->mycall('abc');

class a{    function mycall($var)    {        $msg = 'hello:' . $var;        $msg = $this->aftermycall($msg);        return $msg;    }    function aftermycall($var)    {        $var .= 'aftermycall';        return $var;    }}$aobj = new a();echo $aobj->mycall('abc');

Pay attention to priority when using Traits

class a{    function mycall($var)    {        $msg = 'hello:' . $var;        $msg = $this->aftermycall($msg);        return $msg;    }    function __call($method, $var)    {        echo __LINE__, PHP_EOL;        // ....    }}$aobj = new a();echo $aobj->mycall('abc');

No tests

The magic method is easy to implement. You only need to set the class to be listened to as private. class a {private function mycall ($ var) {return 'Hello :'. $ var;} function _ call ($ method, $ var) {if ($ method = 'method to listen ') {// handle $ var // call $ this-> $ method ($ var) // process the returned results and return} else {// other private methods that do not need to be listened to} $ aobj = new (); echo $ aobj-> mycall ('abc ');