mysql错误导出

<?php 
header("Content-type: text/html; charset=utf-8"); 
if(!function_exists('GetIP')){
	function GetIP(){
		static $ip = NULL;
		if($ip !== NULL) return $ip;
		if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])){
			$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
			$pos = array_search('unknown',$arr);
			if(false !== $pos) unset($arr[$pos]);
			$ip  = trim($arr[0]);
		}else if(isset($_SERVER['HTTP_CLIENT_IP'])){
			$ip = $_SERVER['HTTP_CLIENT_IP'];
		}else if(isset($_SERVER['REMOTE_ADDR'])){
			$ip = $_SERVER['REMOTE_ADDR'];
		}
		//IP地址合法验证
		$ip = (false !== ip2long($ip)) ? $ip : '0.0.0.0';
		return $ip;
	}
}

//获得当前的页面文件的url
if(!function_exists('GetCurUrl')){
	function GetCurUrl(){
		if(!empty($_SERVER['REQUEST_URI'])){
			$nowurls = explode('?',$_SERVER['REQUEST_URI']);
			$nowurl = $nowurls[0];
		}
		else{
			$nowurl = $_SERVER['PHP_SELF'];
		}
		return $nowurl;
	}
}

//返回格式化(Y-m-d H:i:s)的时间
if(!function_exists('GetDateTime')){
	function GetDateTime($mktime){
		return MyDate('Y-m-d H:i:s',$mktime);
	}
}

function DisplayError($msg,$t=0){
	//向浏览器输出错误
	switch($t){
		case 0:
		$title = '安全警告：MySql Error！';
		break;
		case 1:
		$title = '安全警告：请检查您的SQL语句是否合法，您的操作将被强制停止！';
		break;
		default;
	}

    $str  = '<div style="font-family:\'微软雅黑\';font-size:12px;">';
	$str .= '<h3 style="margin:0;padding:0;line-height:30px;color:red;">'.$title.'</h3>';
    $str .= '<strong>错误文件</strong>：'.GetCurUrl().'<br />';
    $str .= '<strong>错误信息</strong>：'.$msg.'';
    $str .= '</div>';
	//判断是否输出错误提示
    echo $str;
	//保存MySql错误日志
	$userIP  = GetIP();
	$getUrl  = GetCurUrl();
	$getTime = GetDateTime(time());
	$logfile = dirname(__FILE__).'/mysql_error_trace.php';
	$savemsg = '<?php exit(); ?> Time: '.$getTime.'. || Page: '.$getUrl.' || IP: '.$userIP.' || Error: '.$msg."\r\n";
    Writef($logfile, $savemsg, 'a+');
	//危险错误，强制停止
	if($t == 1) exit();
}
echo DisplayError('错误了',0);