经测试代码如下：
/**
* 获取当前网址
*
* @param
* @author 编程之家 jb51.cc jb51.cc
**/
function current_urli()
{
$sys_protocal = isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443' ? 'https://' : 'http://';
$PHP_self = $_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME'];
$path_info = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
$relate_url = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : $PHP_self . (isset($_SERVER['QUERY_STRING']) ? '?' . $_SERVER['QUERY_STRING'] : $path_info);
return $sys_protocal . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '') . $relate_url;
}