writelog.php

<?php
//writelog.php
$filename= dirname(__FILE__) . '/ErrorLog.log';
date_default_timezone_set('Asia/Shanghai'); 
$t=time();
$date_time = date("Y-m-d H:i:s",$t);
$str=$date_time . ':error msg!' . "\r\n";

$b=writelog($str,$filename);
if($b)
{
   echo "write file:$filename success!";
}
    function writelog($str,$filename)
    {
        try{
            $open=fopen($filename,"a" );
            //$open=fopen($filename,"w");
            fwrite($open,$str);
            fclose($open);
        }
        catch(Exception $e)
        {
            echo $e->getMessage();
            return false;
        }
        return true;
    }
?>