protected function unsetValue($key) {
		$data = $this->readData();
		unset($data[$key]);
		return $this->writeData($data);
	}
protected function unsetValue($key) {
		$data = $this->readData();
		unset($data[$key]);
		return $this->writeData($data);
	}
protected function unsetValue ( $ key ) { $ data = $ this -> readData ( ) ; unset ( $ data [ $ key ] ) ; return $ this -> writeData ( $ data ) ; }
Removes item from storage
@param string $key
Removes item from storage