php获取当前url

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1 
function get_full_url() {
    $https = !empty($_SERVER['HTTPS']) && strcasecmp($_SERVER['HTTPS'], 'on') === 0 ||
        !empty($_SERVER['HTTP_X_FORWARDED_PROTO']) &&
        strcasecmp($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') === 0;
    return
        ($https ? 'https://' : 'http://').
        (!empty($_SERVER['REMOTE_USER']) ? $_SERVER['REMOTE_USER'].'@' : '').
        (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : ($_SERVER['SERVER_NAME'].
            ($https && $_SERVER['SERVER_PORT'] === 443 ||
            $_SERVER['SERVER_PORT'] === 80 ? '' : ':'.$_SERVER['SERVER_PORT']))).
        substr($_SERVER['SCRIPT_NAME'],0, strrpos($_SERVER['SCRIPT_NAME'], '/'));
}