1. Requirements
2. Usage
3. Resources

Using cache dependencies enables you to be in control of your cached data. Yii provides several dependency methods such as database, file and globalState.

They all work fine but when I use memcached as caching provider, I do not want Yii to check dependencies located on the hard drive everytime Yii::app()->cache->get() is called, that is why I created a new dependency based on the current caching provider.

Requirements ¶

Yii 1.0 or above

Usage ¶

Everytime Yii checks dependencies for changes it performs get(...) on the default caching provider. CacheDependency uses a prefix 'cacheDependency-$dependencyName' to make sure it will not conflict with other cached keys.

if (!($data = Yii::app()->cache->get('key'))) {
    $data = new Model();
    Yii::app()->cache->set(
        'key',
        $data,
        new CacheDependency('myDependency')
    );
}

In this case the dependency will be set on the cache key 'cacheDependency-myDependency'. When the cache needs to be reset, simply set the dependency value to a new value.

Yii::app()->cache->set(CacheDependency::buildCacheId('myDependency'), time());

Resources ¶

• Blog post on yiihaa.com