PHP常用函數大全【不段更新】

<? function GetIP() { //擷取IP     if ($_SERVER["HTTP_X_FORWARDED_FOR"])         $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];     else if ($_SERVER["HTTP_CLIENT_IP"])         $ip = $_SERVER["HTTP_CLIENT_IP"];     else if ($_SERVER["REMOTE_ADDR"])         $ip = $_SERVER["REMOTE_ADDR"];     else if (getenv("HTTP_X_FORWARDED_FOR"))         $ip = getenv("HTTP_X_FORWARDED_FOR");     else if (getenv("HTTP_CLIENT_IP"))         $ip = getenv("HTTP_CLIENT_IP");     else if (getenv("REMOTE_ADDR"))         $ip = getenv("REMOTE_ADDR");     else         $ip = "Unknown";     return $ip; }