File::offsetSet

public function offsetSet($code, $phrase): void
{
	if (!isset($this->messages[$code]))
	{
		if ($this->messagesCount === null)
		{
			$this->messagesCount = 1;
		}
		else
		{
			$this->messagesCount ++;
		}
		$this->messageCodes[] = $code;
	}
	$this->messages[$code] = $phrase;
}