Deprecated Functionality: Zend_Http_UserAgent_Mobile implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary)

[manan-india]

When calling the match($userAgent, $server) function for mobile view in the module, it is giving error

PHP: 8.1
Magento: 2.4.4

[xmav]

Hi! Could you please share more detailed steps to reproduce ?

[manan-india]

Hello!

We have called the function of class(path: vendor/magento/zendframework1/library/Zend/Http/UserAgent/Mobile.php on line 33): This class is implementing the Serializable interface and it is deprecated in PHP 8.1: https://php.watch/versions/8.1/serializable-deprecated.
Implementation:

    public function isMobileDevice()
    {
        $userAgent = $this->httpHeader->getHttpUserAgent();
        $server = $this->getRequest()->getServer();
        $isMobileDevice = \Zend_Http_UserAgent_Mobile::match($userAgent, $server);
        if (!$isMobileDevice) {
            return true;
        }
        return false;
    }

[indrisepos]

You can quickly fix it by commenting out Serialize in Device.php:
interface Zend_Http_UserAgent_Device //extends Serializable

or by adding the two Serialization methods in AbstractDevice.php:
indrisepos#1