HeadBlock::exec

public function exec()
{
	if ($this->isLocked())
	{
		return;
	}

	if ($this->execCustom())
	{
		return;
	}

	$code = trim($this->fields['CODE']);

	if ($code != '')
	{
		self::$lastInsertedCode = $code;
		$code = str_replace(
			'addString($code);
	}
}