PHP，JavaScript 获取当前域名、判断网址协议是否为 HTTPS

1. PHP 判断当前协议是否为 HTTPS

/**
 * 判断当前协议是否为 HTTPS
 */
function is_https()
{
    if ( !empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') {
        return true;
    } elseif ( isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https' ) {
        return true;
    } elseif ( !empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {
        return true;
    }
    return false;
}

2. PHP 获取包含网址协议的当前域名

echo domain();//https://www.itqaq.com

/**
 * 获取包含网址协议的域名
 */
function domain()
{
    $http_type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https' : 'http';
    return $http_type . '://' . $_SERVER['HTTP_HOST'];
}

3. JavaScript 判断当前协议是否为 HTTPS

function is_https()
{
    return 'https:' == location.protocol ? true: false;
}

4. JavaScript 获取包含网址协议的当前域名

var domain = location.protocol + '//' + location.host