Using the Cache component with Predis

To use the Cache component, in addition to configuring the connection as described in the Predis section, you also have to configure the cache component to be [[yii\redis\Cache]]:

return [
    //....
    'components' => [
        // ...
        'redis' => [
            'class' => yii\redis\predis\PredisConnection::class,
            'parameters' => 'tcp://redis:6379',
            // ...
        ],
        'cache' => [
            'class' => yii\redis\Cache::class,
        ],
    ]
];

If you only use the Redis cache (i.e., not using its ActiveRecord or Session), you can also configure the parameters of the connection within the cache component (no connection application component needs to be configured in this case):

return [
    //....
    'components' => [
        // ...
        'cache' => [
            'class' => 'yii\redis\Cache',
            'redis' => [
                'class' => 'yii\redis\predis\PredisConnection',
                'parameters' => 'tcp://redis:6379',
                // ...
            ],
        ],
    ]
];

The cache provides all methods of the [[yii\caching\CacheInterface]]. If you want to access Redis specific methods that are not included in the interface, you can use them via [[yii\redis\Cache::$redis]], which is an instance of [[yii\redis\ConnectionInterface]]:

Yii::$app->cache->redis->hset('mykey', 'somefield', 'somevalue');
Yii::$app->cache->redis->hget('mykey', 'somefield');
...

See [[yii\redis\predis\PredisConnection]] for a full list of available methods.