| abstract protected addValue ( string $key, mixed $value, integer $duration ) : boolean | ||
| $key | string | the key identifying the value to be cached |
| $value | mixed | the value to be cached. Most often it's a string. If you have disabled [[serializer]], it could be something else. |
| $duration | integer | the number of seconds in which the cached value will expire. 0 means never expire. |
| return | boolean | true if the value is successfully stored into cache, false otherwise |
protected abstract function addValue($key, $value, $duration);