PHP获取到当前主域名

主要是获取主域名，自动识别证书，https://www.csdn.net/

可以当普通的函数，或者在框架中添加函数用

function getHostDomain()
{
    // return $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['SERVER_NAME'];
    return getHttpType() . $_SERVER['SERVER_NAME'];
}

/**
 * 获取 HTTPS协议类型
 * @return string
 */
function getHttpType()
{
    return $type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://';
}