exists() public method Checks whether a specified key exists in the cache. This can be faster than getting the value from the cache if the data is big. In case a cache does not support this feature natively, this method will try to simulate it but has no performance improvement over getting it. Note that this method does not check whether the dependency associated with the cached data, if there is any, has changed. So a call to get() may return false while exists returns true. public bool

deleteValue() protected method Deletes a value with the specified key from cache This method should be implemented by child classes to delete the data from actual cache storage. protected boolean deleteValue ( $key )$key string The key of the value to be deleted return boolean If no error happens during deletion

addValue() protected method Stores a value identified by a key into cache if the cache does not contain this key. This method should be implemented by child classes to store the data in specific cache storage. protected boolean addValue ( $key, $value, $duration )$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 w

setValues() protected method Stores multiple key-value pairs in cache. protected array setValues ( $data, $duration )$data array Array where key corresponds to cache key while value $duration integer The number of seconds in which the cached values will expire. 0 means never expire. return array Array of failed keys

setValue() protected method Stores a value identified by a key in cache. This is the implementation of the method declared in the parent class. protected boolean setValue ( $key, $value, $duration )$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 b

init() public method Initializes this application component. It checks if extension required is loaded. public void init ( )

getValues() protected method Retrieves multiple values from cache with the specified keys. protected array getValues ( $keys )$keys array A list of keys identifying the cached values return array A list of cached values indexed by the keys

getValue() protected method Retrieves a value from cache with a specified key. This is the implementation of the method declared in the parent class. protected mixed|false getValue ( $key )$key string A unique key identifying the cached value return mixed|false The value stored in cache, false if the value is not in the cache or expired.

flushValues() protected method Deletes all values from cache. This is the implementation of the method declared in the parent class. protected boolean flushValues ( )return boolean Whether the flush operation was successful.

exists() public method Checks whether a specified key exists in the cache. This can be faster than getting the value from the cache if the data is big. Note that this method does not check whether the dependency associated with the cached data, if there is any, has changed. So a call to get() may return false while exists returns true. public boolean exists ( $key )$key mixed A key identifying the cached value. This can be a simple string or a complex data structure consisting of factors