php 常用获取服务器变量代码

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));