php join函数应用

　　$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);