check is domain in host list or is subDomain

isDomainInListOrIsSubDomain

/**
 * 判断url中的域名是域名列表中的某项或某项的子域名
 * @param string $url [必选]
 * @return bool
 */
public static function isDomainInListOrIsSubDomain($url = '')
{
	$host = parse_url($url, PHP_URL_HOST);
	$blackList = array('a.com', 'b.cn', 'c.com.cn');
	return in_array($host, $blackList) || self::isSubDomain($host, $blackList);
}

/**
 * 判断$host是否为$hostList中某项的子域名
 * @param string $host [必选]
 * @param array $hostList [必选]
 * @return bool
 */
public static function isSubDomain($host = '', $hostList = array())
{
	foreach ($hostList as $primaryDomain)
	{
		preg_match('/^[a-zA-Z0-9\.-]+' . $primaryDomain . '/', $host, $matches);
		if (!empty($matches))
		{
			return true;
		}
	}
	return false;
}