core/Request.php
public static function getReferrer()
    {
        $referer = self::getHeader('referer');
        if (empty($referer)) {
            $referer = self::getHeader('referrer');
        }
        return $referer;
    }
public static function getReferrer()
    {
        $referer = self::getHeader('referer');
        if (empty($referer)) {
            $referer = self::getHeader('referrer');
        }
        return $referer;
    }
获取来源页
@return array|mixed|null|string