Redis Cache - Deprecated: unserialize(): Passing null to parameter #1.

[alexius]

Hello everybody,
after updating Yii 1 to the version 1.1.27 we got this error:

Deprecated: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in /srv/www/htdocs/ilya/mike.matthies.p2/protected/framework/caching/CCache.php on line 108

What steps will reproduce the problem?

We use cache during SQL request:

$query = Yii::app()->db->cache(3600) ->createCommand() ->select('*, id') ->from('table') ->where('cond=1'); $rows = $query->queryAll();

The function
CDbCommand->queryAll( $fetchAssociative = ???, $params = ??? )
uses another function
CDbCommand->queryInternal( $method = 'fetchAll', $mode = [0 => 2], $params = [] ), which uses the function
CCache->get( ...). There is a code in function CCache->get( ...):

if($this->serializer===null) $value=unserialize($value);

which should be adjust. Passing null as a value to the function 'unserialize()' is deprecated now.

What is the expected result?

If null, the function should just return value as for the case when we have false.

What do you get instead?

We get error 'Deprecated'.

Additional info

Q	A
Yii version	1.1.27
PHP version	8.1.2
Operating system	Ubuntu 22.04.1 LTS

[rob006]

Which cache backend you're using?

[alexius]

Which cache backend you're using?

We use Redis.

I see that this issue is going to be resolve. Thanks

[alexius]

There is another problem too - when we use the cache (php8+Yii+Redis), we get this problem
Fatal error: Uncaught CDbException: The table "tablename" for active record class "TablenameRecord" cannot be found in the database. in /srv/www/htdocs/.../framework/db/ar/CActiveRecord.php on line 2391 CDbException: The table "tablename" for active record class "TablenameRecord" cannot be found in the database. in /srv/www/htdocs/.../framework/db/ar/CActiveRecord.php on line 2391
When we cancel the use of the cache, the error disappears. Just comment out these lines in main.conf:
'cache'=>array( 'class'=>'CRedisCache', 'hostname'=> 'localhost', 'port'=>6379, 'database'=>1, ),
The table is existed in DB.

Why it happens and what can we do?

Thank you!

[marcovtwout]

@alexius We recently had a similar case in #4480 with unserialize(null) which turned out to be a problem in application code, not in framework code. Could you provide a bit more thorough reproducible sample code that demonstrates this issue so we can investigate?

There is another problem too (..)

Please create a new issue for this and fill out the required details.

[alexius]

@marcovtwout I did.

[marcovtwout]

@wtommyw confirmed this issue is reproducable with CRedis and the correct fix by #4496

[marcovtwout]

Fixed by #4496