join应用！

$key = array();
   $val = array();
   foreach ($_POST as $k=>$v)
   {
    $key[] = '`'.strip_tags(mysql_real_escape_string(trim($k))).'`';
    $val[] = "'".strip_tags(mysql_real_escape_string(trim($v)))."'";
   }
   
   $keys = join(",",$key);
   $vals = join(",",$val);