$dirMode public property The permission to be set for newly created directories. This value will be used by PHP chmod() function. No umask will be applied. Defaults to 0775, meaning the directory is read-writable by owner and group, but read-only for other users. public integer $dirMode = 509

$directoryLevel public property The level of sub-directories to store cache files. Defaults to 1. If the system has huge number of cache files (e.g. one million), you may use a bigger value (usually no bigger than 3). Using sub-directories is mainly to ensure the file system is not over burdened with a single directory having too many files. public integer $directoryLevel = 1

$cachePath public property The directory to store cache files. You may use path alias here. If not set, it will use the "cache" subdirectory under the application runtime path. public string $cachePath = '@runtime/cache'

$cacheFileSuffix public property Cache file suffix. Defaults to '.bin'. public string $cacheFileSuffix = '.bin'

generateDependencyData() protected method Generates the data needed to determine if dependency has been changed. This method returns the result of the PHP expression. protected mixed generateDependencyData ( $cache )$cache yii\caching\Cache The cache component that is currently evaluating this dependency return mixed The data needed to determine if dependency has been changed.

$params public property Custom parameters associated with this dependency. You may get the value of this property in $expression using $this->params. public mixed $params = null

$expression public property The string representation of a PHP expression whose result is used to determine the dependency. A PHP expression can be any PHP code that evaluates to a value. To learn more about what an expression is, please refer to the php manual. public string $expression = 'true'

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 $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

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.