public function remove($key)
    {
        if ($this->has($key)) {
            unset($this->cache[$key]);
            return true;
        } else {
            return false;
        }
    }
public function remove($key)
    {
        if ($this->has($key)) {
            unset($this->cache[$key]);
            return true;
        } else {
            return false;
        }
    }
public function remove ( $ key ) { if ( $ this -> has ( $ key ) ) { unset ( $ this -> cache [ $ key ] ) ; return true ; } else { return false ; } }
Removes a key from the memory

@param string $key
@return boolean True if removed, false if could not
Removes a key from the memory