public function delete($key) {
        $used_key = $this->getUsedKey($key);
        return ($this->redis->delete($used_key) > 0);
    }
public function delete($key) {
        $used_key = $this->getUsedKey($key);
        return ($this->redis->delete($used_key) > 0);
    }
public function delete ( $ key ) { $ used_key = $ this -> getUsedKey ( $ key ) ; return ( $ this -> redis -> delete ( $ used_key ) > 0 ) ; }
delete a specific data in the cache
@param string $key    key used for storing data in the cache
@return boolean       false if failure
delete a specific data in the cache