File::offsetUnset

public function offsetUnset($code): void
{
	if (isset($this->messages[$code]))
	{
		unset($this->messages[$code]);
		$this->messagesCount --;
		if (($i = array_search($code, $this->messageCodes)) !== false)
		{
			unset($this->messageCodes[$i]);
		}
	}
}