还是在PHP实战书上看到的，很多不懂，太高深了



看代码吧，自己可以拿去运行，log.php是Pear 的log类，自己去下载回来，在包的根目录里有

<?php

//PHP重载，利用pear log类 完成方法调用日志记录

require_once "./Log.php";



class Logging{

    function __call($method,$args)

    {

        $method="_$method";

        if(!method_exists($this,$method))

        {

            throw new Exception("Call to undefined method ".get_class($this)."::$method");

        }

        $log = Log::singleton('file',"./user.log",'Methods',NULL,LOG_INFO);

        $log->log("Just starting method $method");

        $return=call_user_func_array(array($this,$method),$args);

        $log->log("Just finished method $method");

        return $return;

    }

}



class DateAndTime extends Logging

{

    private $timestamp;

    

    function __construct($timestamp=false)

    {

        $this->_init($timestamp);

    }

    protected function _init($timestamp)

    {

        $this->timestamp=$timestamp?$timestamp:time();

    }

    function getTimestamp()

    {

        return $this->timestamp;

    }

    protected function _before(DateAndTime $other)

    {

        return $this->timestamp < $other->getTimestamp();

    }

}



$now=new DateAndTime();

$nexthour=new DateAndTime(time()+3600);

print_r(array($now,$nexthour));

if($now->before($nexthour))

{

    echo "OK\n";

}

?>