yii\caching\FileCache::deleteValue PHP Метод

Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class.

protected deleteValue ( string $key ) : boolean
$key	string	the key of the value to be deleted
Результат	boolean	if no error happens during deletion

    protected function deleteValue($key)
    {
        $cacheFile = $this->getCacheFile($key);
        return @unlink($cacheFile);
    }

FileCache