一个PHP的有关问题，着急求解，困扰好久了，求大牛们帮助

$query = mysql_query("select old_title from pagecontents where old_id = 6316 ") or die(mysql_error() );

while ($rows=mysql_fetch_array($query))
{
    $a = $rows['old_title'];
         ...... 

$a = preg_replace('/[\w.\/()]/i', '$0 ', $rows['old_title']);