Block::setAnchor

public function setAnchor($anchor)
{
	if (!is_string($anchor))
	{
		return false;
	}
	$anchor = trim($anchor);
	$check = !$anchor || preg_match_all('/^[a-z]{1}[a-z0-9-_.:]+$/i', $anchor);
	if (!$check)
	{
		$this->error->addError(
			'BAD_ANCHOR',
			Loc::getMessage('LANDING_BLOCK_BAD_ANCHOR')
		);
		return false;
	}

	if (History::isActive())
	{
		$history = new History($this->getLandingId(), History::ENTITY_TYPE_LANDING);
		$history->push('CHANGE_ANCHOR', [
			'block' => $this,
			'valueBefore' => $this->anchor,
			'valueAfter' => $anchor,
		]);
	}

	$this->anchor = $anchor;
	return true;
}