PHP Common get server variable code

Define (' IP ', IP ());
Define (' Http_referer ', isset ($_server[' http_referer ') "$_server[' Http_referer ']:");
Define (' Script_name ', isset ($_server[' script_name ')? $_server[' Script_name ']: Preg_replace ("/() *). PHP (. *)/I", "\ 1.php ", $_server[' php_self ']);
Define (' Query_string ', $_server[' query_string '));
Define (' Path_info ', isset ($_server[' path_info ') "$_server[' Path_info ']:");
Define (' DOMAIN ', isset ($_server[' server_name ')? $_server[' server_name ']: Preg_replace ("[^:]*] [: 0-9]*/i", "\1", $ _server[' Http_host '));
Define (' SCHEME ', $_server[' server_port '] = = ' 443 '? ' https://': ' http://');
Define (' Site_url ', scheme.$_server[' http_host '). Phpcms_path);
Define (' Relate_url ', isset ($_server[' Request_uri ')? $_server[' Request_uri ']: Script_name. ( Query_string? '?'. Query_string:path_info));
Define (' URL ', scheme.$_server[' http_host '). Relate_url);
Define (' Relate_referer ', UrlEncode (Relate_url));