ubb编写求助

<?php
if(preg_match('/\[bbs_([1-9])\]/Us',$text,$gg)){
$nr=explode('＠＠＠',file_get_contents("{$_SERVER['DOCUMENT_ROOT']}/file/db/tiezi.txt"));
$zs=count($nr)-1;
$zsa=$zs-$gg[1];
for($i=$zs;$tid>=$zas&&$i>=1;$i--){
$title=explode('-----',$nr[$i]);
echo "<a href='tiezi.html?id={$i}'>{$title[0]}</a><br />";
}}
?>