Fixed Notification not received for second like action from same user

OS & Browser: Mac OS X High Sierra, Safari Version 13.1.2 Location on site: Global issue Description of bug: You only receive a notification for the first 'like' given by a user sometimes. Steps to reproduce: Like two posts of the same author from the same account, and observe that only one notification is produced (for the first like action). Any further information: Please see relevant bug report tickets on phpBB and on Github.

	public static function get_item_id($data)
	{
		return (int) $data['requester_id'];
	}

	public static function get_item_id($data)
	{
		return (int) $data['post_id'];
	}

	public static function get_item_parent_id($data)
	{
		return (int) $data['post_id'];
	}

	public static function get_item_parent_id($data)
	{
		return (int) $data['requester_id'];
	}