public static function WriteLog($msg,$module = null,$logLevel = "DEBUG")

    {

        $filepath = $_SESSION["APP_ROOT"]."/log/";

        if(!is_dir($filepath)) mkdir($filepath,'0777');

        $MyLogFile = @fopen($filepath.date("Y-m-d").".txt",'a+');

        $time = date("Y-m-d H:i:s");

        if(isset($module)){$module =  sprintf("\r\n归属模块：".$module."\r\n");}

        $logLine = "\r\n-------------------------------  $time -------------------------------\r\n";

        $logLine .= $module;

        $logLine .= "\r\n异常信息：$msg\r\n";

        $logLine .= "\r\n错误等级：$logLevel\r\n";

        fwrite($MyLogFile,$logLine);

    }

<?php

ini_set('date.timezone','Asia/Shanghai');

/**

* PHP log 类

*/

class mylog

{

    private $LogFile;

    private $logLevel;

    const DEBUG  = 100;

    const INFO   = 75;

    const NOTICE = 50;

    const WARNING =25;

    const ERROR   = 10;

    const CRITICAL = 5; 

    private function __construct()

    {

        $this->logLevel = 100;

        $filepath = $_SESSION["APP_ROOT"]."/log/";

        $filename = date("Y-m-d").".txt";

        if(!is_dir($filepath)) mkdir($filepath,'0777');

        $this->LogFile = @fopen($filepath.$filename,'a+');

    }  

    public static function getInstance()

    {

        static $obj;

        if(!isset($obj)){

            $obj = new mylog();

        }

        return $obj;

    }

    public static function WriteLog($msg,$module = null,$logLevel = "DEBUG")

    {

        $filepath = $_SESSION["APP_ROOT"]."/log/";

        if(!is_dir($filepath)) mkdir($filepath,'0777');

        $MyLogFile = @fopen($filepath.date("Y-m-d").".txt",'a+');     

        $time = date("Y-m-d H:i:s");

        if(isset($module)){$module =  sprintf("\r\n归属模块：".$module."\r\n");}

        $logLine = "\r\n-------------------------------  $time -------------------------------\r\n";

        $logLine .= $module;

        $logLine .= "\r\n异常信息：$msg\r\n";

       $logLine .= "\r\n错误等级：$logLevel\r\n";

        fwrite($MyLogFile,$logLine);

    }

    public  function LogMessage($msg,$module = null,$logLevel = mylog::DEBUG)

    {

         $time = date("Y-m-d H:i:s");

         $strLogLevel = $this->levelToString($logLevel);

         if(isset($module)){$module =  sprintf("\r\n归属模块：".$module."\r\n");}

         $logLine = "\r\n-------------------------------  $time -------------------------------\r\n";

         $logLine .= $module;

         $logLine .= "\r\n错误信息：$msg\r\n";

         $logLine .= "\r\n错误等级：$strLogLevel\r\n";

         fwrite($this->LogFile,$logLine);

    }

    public function levelToString($logLevel)

    {

         $ret = '[unknow]';

         switch ($logLevel){

                case mylog::DEBUG:

                     $ret = 'DEBUG';

                     break;

                case mylog::INFO:

                     $ret = 'INFO';

                     break;

                case mylog::NOTICE:

                     $ret = 'NOTICE';

                     break;

                case mylog::WARNING:

                     $ret = 'WARNING';

                     break;

                case mylog::ERROR:

                     $ret = 'ERROR';

                     break;

                case mylog::CRITICAL:

                     $ret = 'CRITICAL';

                     break;

         }

         return $ret;

    }

}

?>

<?php

//     include $_SESSION["APP_ROOT"].'/Lib/Class/Log.class.php';

//     $logIns = LOG::getInstance();

//     $logIns->LogMessage("测试一下");

//或者

//      mylog::WriteLog("可以了");

?>