--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/forum/Sources/SplitTopics.php	Sun Jul 07 11:25:48 2013 +0200
@@ -0,0 +1,1576 @@
+<?php
+
+/**
+ * Simple Machines Forum (SMF)
+ *
+ * @package SMF
+ * @author Simple Machines http://www.simplemachines.org
+ * @copyright 2011 Simple Machines
+ * @license http://www.simplemachines.org/about/smf/license.php BSD
+ *
+ * @version 2.0
+ */
+
+// Original module by Mach8 - We'll never forget you.
+
+if (!defined('SMF'))
+	die('Hacking attempt...');
+
+/*	This file handles merging and splitting topics... it does this with:
+
+	void SplitTopics()
+		- splits a topic into two topics.
+		- delegates to the other functions (based on the URL parameter 'sa').
+		- loads the SplitTopics template.
+		- requires the split_any permission.
+		- is accessed with ?action=splittopics.
+
+	void SplitIndex()
+		- screen shown before the actual split.
+		- is accessed with ?action=splittopics;sa=index.
+		- default sub action for ?action=splittopics.
+		- uses 'ask' sub template of the SplitTopics template.
+		- redirects to SplitSelectTopics if the message given turns out to be
+		  the first message of a topic.
+		- shows the user three ways to split the current topic.
+
+	void SplitExecute()
+		- do the actual split.
+		- is accessed with ?action=splittopics;sa=execute.
+		- uses the main SplitTopics template.
+		- supports three ways of splitting:
+		   (1) only one message is split off.
+		   (2) all messages after and including a given message are split off.
+		   (3) select topics to split (redirects to SplitSelectTopics()).
+		- uses splitTopic function to do the actual splitting.
+
+	void SplitSelectTopics()
+		- allows the user to select the messages to be split.
+		- is accessed with ?action=splittopics;sa=selectTopics.
+		- uses 'select' sub template of the SplitTopics template or (for
+		  XMLhttp) the 'split' sub template of the Xml template.
+		- supports XMLhttp for adding/removing a message to the selection.
+		- uses a session variable to store the selected topics.
+		- shows two independent page indexes for both the selected and
+		  not-selected messages (;topic=1.x;start2=y).
+
+	void SplitSelectionExecute()
+		- do the actual split of a selection of topics.
+		- is accessed with ?action=splittopics;sa=splitSelection.
+		- uses the main SplitTopics template.
+		- uses splitTopic function to do the actual splitting.
+
+	int splitTopic(int topicID, array messagesToBeSplit, string newSubject)
+		- general function to split off a topic.
+		- creates a new topic and moves the messages with the IDs in
+		  array messagesToBeSplit to the new topic.
+		- the subject of the newly created topic is set to 'newSubject'.
+		- marks the newly created message as read for the user splitting it.
+		- updates the statistics to reflect a newly created topic.
+		- logs the action in the moderation log.
+		- a notification is sent to all users monitoring this topic.
+		- returns the topic ID of the new split topic.
+
+	void MergeTopics()
+		- merges two or more topics into one topic.
+		- delegates to the other functions (based on the URL parameter sa).
+		- loads the SplitTopics template.
+		- requires the merge_any permission.
+		- is accessed with ?action=mergetopics.
+
+	void MergeIndex()
+		- allows to pick a topic to merge the current topic with.
+		- is accessed with ?action=mergetopics;sa=index
+		- default sub action for ?action=mergetopics.
+		- uses 'merge' sub template of the SplitTopics template.
+		- allows to set a different target board.
+
+	void MergeExecute(array topics = request)
+		- set merge options and do the actual merge of two or more topics.
+		- the merge options screen:
+			- shows topics to be merged and allows to set some merge options.
+			- is accessed by ?action=mergetopics;sa=options.and can also
+			  internally be called by QuickModeration() (Subs-Boards.php).
+			- uses 'merge_extra_options' sub template of the SplitTopics
+			  template.
+		- the actual merge:
+			- is accessed with ?action=mergetopics;sa=execute.
+			- updates the statistics to reflect the merge.
+			- logs the action in the moderation log.
+			- sends a notification is sent to all users monitoring this topic.
+			- redirects to ?action=mergetopics;sa=done.
+
+	void MergeDone()
+		- shows a 'merge completed' screen.
+		- is accessed with ?action=mergetopics;sa=done.
+		- uses 'merge_done' sub template of the SplitTopics template.
+*/
+
+// Split a topic into two separate topics... in case it got offtopic, etc.
+function SplitTopics()
+{
+	global $topic, $sourcedir;
+
+	// And... which topic were you splitting, again?
+	if (empty($topic))
+		fatal_lang_error('numbers_one_to_nine', false);
+
+	// Are you allowed to split topics?
+	isAllowedTo('split_any');
+
+	// Load up the "dependencies" - the template, getMsgMemberID(), and sendNotifications().
+	if (!isset($_REQUEST['xml']))
+		loadTemplate('SplitTopics');
+	require_once($sourcedir . '/Subs-Boards.php');
+	require_once($sourcedir . '/Subs-Post.php');
+
+	$subActions = array(
+		'selectTopics' => 'SplitSelectTopics',
+		'execute' => 'SplitExecute',
+		'index' => 'SplitIndex',
+		'splitSelection' => 'SplitSelectionExecute',
+	);
+
+	// ?action=splittopics;sa=LETSBREAKIT won't work, sorry.
+	if (empty($_REQUEST['sa']) || !isset($subActions[$_REQUEST['sa']]))
+		SplitIndex();
+	else
+		$subActions[$_REQUEST['sa']]();
+}
+
+// Part 1: General stuff.
+function SplitIndex()
+{
+	global $txt, $topic, $context, $smcFunc, $modSettings;
+
+	// Validate "at".
+	if (empty($_GET['at']))
+		fatal_lang_error('numbers_one_to_nine', false);
+	$_GET['at'] = (int) $_GET['at'];
+
+	// Retrieve the subject and stuff of the specific topic/message.
+	$request = $smcFunc['db_query']('', '
+		SELECT m.subject, t.num_replies, t.unapproved_posts, t.id_first_msg, t.approved
+		FROM {db_prefix}messages AS m
+			INNER JOIN {db_prefix}topics AS t ON (t.id_topic = {int:current_topic})
+		WHERE m.id_msg = {int:split_at}' . (!$modSettings['postmod_active'] || allowedTo('approve_posts') ? '' : '
+			AND m.approved = 1') . '
+			AND m.id_topic = {int:current_topic}
+		LIMIT 1',
+		array(
+			'current_topic' => $topic,
+			'split_at' => $_GET['at'],
+		)
+	);
+	if ($smcFunc['db_num_rows']($request) == 0)
+		fatal_lang_error('cant_find_messages');
+	list ($_REQUEST['subname'], $num_replies, $unapproved_posts, $id_first_msg, $approved) = $smcFunc['db_fetch_row']($request);
+	$smcFunc['db_free_result']($request);
+
+	// If not approved validate they can see it.
+	if ($modSettings['postmod_active'] && !$approved)
+		isAllowedTo('approve_posts');
+
+	// If this topic has unapproved posts, we need to count them too...
+	if ($modSettings['postmod_active'] && allowedTo('approve_posts'))
+		$num_replies += $unapproved_posts - ($approved ? 0 : 1);
+
+	// Check if there is more than one message in the topic.  (there should be.)
+	if ($num_replies < 1)
+		fatal_lang_error('topic_one_post', false);
+
+	// Check if this is the first message in the topic (if so, the first and second option won't be available)
+	if ($id_first_msg == $_GET['at'])
+		return SplitSelectTopics();
+
+	// Basic template information....
+	$context['message'] = array(
+		'id' => $_GET['at'],
+		'subject' => $_REQUEST['subname']
+	);
+	$context['sub_template'] = 'ask';
+	$context['page_title'] = $txt['split'];
+}
+
+// Alright, you've decided what you want to do with it.... now to do it.
+function SplitExecute()
+{
+	global $txt, $board, $topic, $context, $user_info, $smcFunc, $modSettings;
+
+	// Check the session to make sure they meant to do this.
+	checkSession();
+
+	// Clean up the subject.
+	if (!isset($_POST['subname']) || $_POST['subname'] == '')
+		$_POST['subname'] = $txt['new_topic'];
+
+	// Redirect to the selector if they chose selective.
+	if ($_POST['step2'] == 'selective')
+	{
+		$_REQUEST['subname'] = $_POST['subname'];
+		return SplitSelectTopics();
+	}
+
+	$_POST['at'] = (int) $_POST['at'];
+	$messagesToBeSplit = array();
+
+	if ($_POST['step2'] == 'afterthis')
+	{
+		// Fetch the message IDs of the topic that are at or after the message.
+		$request = $smcFunc['db_query']('', '
+			SELECT id_msg
+			FROM {db_prefix}messages
+			WHERE id_topic = {int:current_topic}
+				AND id_msg >= {int:split_at}',
+			array(
+				'current_topic' => $topic,
+				'split_at' => $_POST['at'],
+			)
+		);
+		while ($row = $smcFunc['db_fetch_assoc']($request))
+			$messagesToBeSplit[] = $row['id_msg'];
+		$smcFunc['db_free_result']($request);
+	}
+	// Only the selected message has to be split. That should be easy.
+	elseif ($_POST['step2'] == 'onlythis')
+		$messagesToBeSplit[] = $_POST['at'];
+	// There's another action?!
+	else
+		fatal_lang_error('no_access', false);
+
+	$context['old_topic'] = $topic;
+	$context['new_topic'] = splitTopic($topic, $messagesToBeSplit, $_POST['subname']);
+	$context['page_title'] = $txt['split'];
+}
+
+// Get a selective list of topics...
+function SplitSelectTopics()
+{
+	global $txt, $scripturl, $topic, $context, $modSettings, $original_msgs, $smcFunc, $options;
+
+	$context['page_title'] = $txt['split'] . ' - ' . $txt['select_split_posts'];
+
+	// Haven't selected anything have we?
+	$_SESSION['split_selection'][$topic] = empty($_SESSION['split_selection'][$topic]) ? array() : $_SESSION['split_selection'][$topic];
+
+	$context['not_selected'] = array(
+		'num_messages' => 0,
+		'start' => empty($_REQUEST['start']) ? 0 : (int) $_REQUEST['start'],
+		'messages' => array(),
+	);
+
+	$context['selected'] = array(
+		'num_messages' => 0,
+		'start' => empty($_REQUEST['start2']) ? 0 : (int) $_REQUEST['start2'],
+		'messages' => array(),
+	);
+
+	$context['topic'] = array(
+		'id' => $topic,
+		'subject' => urlencode($_REQUEST['subname']),
+	);
+
+	// Some stuff for our favorite template.
+	$context['new_subject'] = $_REQUEST['subname'];
+
+	// Using the "select" sub template.
+	$context['sub_template'] = isset($_REQUEST['xml']) ? 'split' : 'select';
+
+	// Are we using a custom messages per page?
+	$context['messages_per_page'] = empty($modSettings['disableCustomPerPage']) && !empty($options['messages_per_page']) ? $options['messages_per_page'] : $modSettings['defaultMaxMessages'];
+
+	// Get the message ID's from before the move.
+	if (isset($_REQUEST['xml']))
+	{
+		$original_msgs = array(
+			'not_selected' => array(),
+			'selected' => array(),
+		);
+		$request = $smcFunc['db_query']('', '
+			SELECT id_msg
+			FROM {db_prefix}messages
+			WHERE id_topic = {int:current_topic}' . (empty($_SESSION['split_selection'][$topic]) ? '' : '
+				AND id_msg NOT IN ({array_int:no_split_msgs})') . (!$modSettings['postmod_active'] || allowedTo('approve_posts') ? '' : '
+				AND approved = {int:is_approved}') . '
+			ORDER BY id_msg DESC
+			LIMIT {int:start}, {int:messages_per_page}',
+			array(
+				'current_topic' => $topic,
+				'no_split_msgs' => empty($_SESSION['split_selection'][$topic]) ? array() : $_SESSION['split_selection'][$topic],
+				'is_approved' => 1,
+				'start' => $context['not_selected']['start'],
+				'messages_per_page' => $context['messages_per_page'],
+			)
+		);
+		// You can't split the last message off.
+		if (empty($context['not_selected']['start']) && $smcFunc['db_num_rows']($request) <= 1 && $_REQUEST['move'] == 'down')
+			$_REQUEST['move'] = '';
+		while ($row = $smcFunc['db_fetch_assoc']($request))
+			$original_msgs['not_selected'][] = $row['id_msg'];
+		$smcFunc['db_free_result']($request);
+		if (!empty($_SESSION['split_selection'][$topic]))
+		{
+			$request = $smcFunc['db_query']('', '
+				SELECT id_msg
+				FROM {db_prefix}messages
+				WHERE id_topic = {int:current_topic}
+					AND id_msg IN ({array_int:split_msgs})' . (!$modSettings['postmod_active'] || allowedTo('approve_posts') ? '' : '
+					AND approved = {int:is_approved}') . '
+				ORDER BY id_msg DESC
+				LIMIT {int:start}, {int:messages_per_page}',
+				array(
+					'current_topic' => $topic,
+					'split_msgs' => $_SESSION['split_selection'][$topic],
+					'is_approved' => 1,
+					'start' => $context['selected']['start'],
+					'messages_per_page' => $context['messages_per_page'],
+				)
+			);
+			while ($row = $smcFunc['db_fetch_assoc']($request))
+				$original_msgs['selected'][] = $row['id_msg'];
+			$smcFunc['db_free_result']($request);
+		}
+	}
+
+	// (De)select a message..
+	if (!empty($_REQUEST['move']))
+	{
+		$_REQUEST['msg'] = (int) $_REQUEST['msg'];
+
+		if ($_REQUEST['move'] == 'reset')
+			$_SESSION['split_selection'][$topic] = array();
+		elseif ($_REQUEST['move'] == 'up')
+			$_SESSION['split_selection'][$topic] = array_diff($_SESSION['split_selection'][$topic], array($_REQUEST['msg']));
+		else
+			$_SESSION['split_selection'][$topic][] = $_REQUEST['msg'];
+	}
+
+	// Make sure the selection is still accurate.
+	if (!empty($_SESSION['split_selection'][$topic]))
+	{
+		$request = $smcFunc['db_query']('', '
+			SELECT id_msg
+			FROM {db_prefix}messages
+			WHERE id_topic = {int:current_topic}
+				AND id_msg IN ({array_int:split_msgs})' . (!$modSettings['postmod_active'] || allowedTo('approve_posts') ? '' : '
+				AND approved = {int:is_approved}'),
+			array(
+				'current_topic' => $topic,
+				'split_msgs' => $_SESSION['split_selection'][$topic],
+				'is_approved' => 1,
+			)
+		);
+		$_SESSION['split_selection'][$topic] = array();
+		while ($row = $smcFunc['db_fetch_assoc']($request))
+			$_SESSION['split_selection'][$topic][] = $row['id_msg'];
+		$smcFunc['db_free_result']($request);
+	}
+
+	// Get the number of messages (not) selected to be split.
+	$request = $smcFunc['db_query']('', '
+		SELECT ' . (empty($_SESSION['split_selection'][$topic]) ? '0' : 'm.id_msg IN ({array_int:split_msgs})') . ' AS is_selected, COUNT(*) AS num_messages
+		FROM {db_prefix}messages AS m
+		WHERE m.id_topic = {int:current_topic}' . (!$modSettings['postmod_active'] || allowedTo('approve_posts') ? '' : '
+			AND approved = {int:is_approved}') . (empty($_SESSION['split_selection'][$topic]) ? '' : '
+		GROUP BY is_selected'),
+		array(
+			'current_topic' => $topic,
+			'split_msgs' => !empty($_SESSION['split_selection'][$topic]) ? $_SESSION['split_selection'][$topic] : array(),
+			'is_approved' => 1,
+		)
+	);
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+		$context[empty($row['is_selected']) ? 'not_selected' : 'selected']['num_messages'] = $row['num_messages'];
+	$smcFunc['db_free_result']($request);
+
+	// Fix an oversized starting page (to make sure both pageindexes are properly set).
+	if ($context['selected']['start'] >= $context['selected']['num_messages'])
+		$context['selected']['start'] = $context['selected']['num_messages'] <= $context['messages_per_page'] ? 0 : ($context['selected']['num_messages'] - (($context['selected']['num_messages'] % $context['messages_per_page']) == 0 ? $context['messages_per_page'] : ($context['selected']['num_messages'] % $context['messages_per_page'])));
+
+	// Build a page list of the not-selected topics...
+	$context['not_selected']['page_index'] = constructPageIndex($scripturl . '?action=splittopics;sa=selectTopics;subname=' . strtr(urlencode($_REQUEST['subname']), array('%' => '%%')) . ';topic=' . $topic . '.%1$d;start2=' . $context['selected']['start'], $context['not_selected']['start'], $context['not_selected']['num_messages'], $context['messages_per_page'], true);
+	// ...and one of the selected topics.
+	$context['selected']['page_index'] = constructPageIndex($scripturl . '?action=splittopics;sa=selectTopics;subname=' . strtr(urlencode($_REQUEST['subname']), array('%' => '%%')) . ';topic=' . $topic . '.' . $context['not_selected']['start'] . ';start2=%1$d', $context['selected']['start'], $context['selected']['num_messages'], $context['messages_per_page'], true);
+
+	// Get the messages and stick them into an array.
+	$request = $smcFunc['db_query']('', '
+		SELECT m.subject, IFNULL(mem.real_name, m.poster_name) AS real_name, m.poster_time, m.body, m.id_msg, m.smileys_enabled
+		FROM {db_prefix}messages AS m
+			LEFT JOIN {db_prefix}members AS mem ON (mem.id_member = m.id_member)
+		WHERE m.id_topic = {int:current_topic}' . (empty($_SESSION['split_selection'][$topic]) ? '' : '
+			AND id_msg NOT IN ({array_int:no_split_msgs})') . (!$modSettings['postmod_active'] || allowedTo('approve_posts') ? '' : '
+			AND approved = {int:is_approved}') . '
+		ORDER BY m.id_msg DESC
+		LIMIT {int:start}, {int:messages_per_page}',
+		array(
+			'current_topic' => $topic,
+			'no_split_msgs' => !empty($_SESSION['split_selection'][$topic]) ? $_SESSION['split_selection'][$topic] : array(),
+			'is_approved' => 1,
+			'start' => $context['not_selected']['start'],
+			'messages_per_page' => $context['messages_per_page'],
+		)
+	);
+	$context['messages'] = array();
+	for ($counter = 0; $row = $smcFunc['db_fetch_assoc']($request); $counter ++)
+	{
+		censorText($row['subject']);
+		censorText($row['body']);
+
+		$row['body'] = parse_bbc($row['body'], $row['smileys_enabled'], $row['id_msg']);
+
+		$context['not_selected']['messages'][$row['id_msg']] = array(
+			'id' => $row['id_msg'],
+			'alternate' => $counter % 2,
+			'subject' => $row['subject'],
+			'time' => timeformat($row['poster_time']),
+			'timestamp' => forum_time(true, $row['poster_time']),
+			'body' => $row['body'],
+			'poster' => $row['real_name'],
+		);
+	}
+	$smcFunc['db_free_result']($request);
+
+	// Now get the selected messages.
+	if (!empty($_SESSION['split_selection'][$topic]))
+	{
+		// Get the messages and stick them into an array.
+		$request = $smcFunc['db_query']('', '
+			SELECT m.subject, IFNULL(mem.real_name, m.poster_name) AS real_name,  m.poster_time, m.body, m.id_msg, m.smileys_enabled
+			FROM {db_prefix}messages AS m
+				LEFT JOIN {db_prefix}members AS mem ON (mem.id_member = m.id_member)
+			WHERE m.id_topic = {int:current_topic}
+				AND m.id_msg IN ({array_int:split_msgs})' . (!$modSettings['postmod_active'] || allowedTo('approve_posts') ? '' : '
+				AND approved = {int:is_approved}') . '
+			ORDER BY m.id_msg DESC
+			LIMIT {int:start}, {int:messages_per_page}',
+			array(
+				'current_topic' => $topic,
+				'split_msgs' => $_SESSION['split_selection'][$topic],
+				'is_approved' => 1,
+				'start' => $context['selected']['start'],
+				'messages_per_page' => $context['messages_per_page'],
+			)
+		);
+		$context['messages'] = array();
+		for ($counter = 0; $row = $smcFunc['db_fetch_assoc']($request); $counter ++)
+		{
+			censorText($row['subject']);
+			censorText($row['body']);
+
+			$row['body'] = parse_bbc($row['body'], $row['smileys_enabled'], $row['id_msg']);
+
+			$context['selected']['messages'][$row['id_msg']] = array(
+				'id' => $row['id_msg'],
+				'alternate' => $counter % 2,
+				'subject' => $row['subject'],
+				'time' => timeformat($row['poster_time']),
+				'timestamp' => forum_time(true, $row['poster_time']),
+				'body' => $row['body'],
+				'poster' => $row['real_name']
+			);
+		}
+		$smcFunc['db_free_result']($request);
+	}
+
+	// The XMLhttp method only needs the stuff that changed, so let's compare.
+	if (isset($_REQUEST['xml']))
+	{
+		$changes = array(
+			'remove' => array(
+				'not_selected' => array_diff($original_msgs['not_selected'], array_keys($context['not_selected']['messages'])),
+				'selected' => array_diff($original_msgs['selected'], array_keys($context['selected']['messages'])),
+			),
+			'insert' => array(
+				'not_selected' => array_diff(array_keys($context['not_selected']['messages']), $original_msgs['not_selected']),
+				'selected' => array_diff(array_keys($context['selected']['messages']), $original_msgs['selected']),
+			),
+		);
+
+		$context['changes'] = array();
+		foreach ($changes as $change_type => $change_array)
+			foreach ($change_array as $section => $msg_array)
+			{
+				if (empty($msg_array))
+					continue;
+
+				foreach ($msg_array as $id_msg)
+				{
+					$context['changes'][$change_type . $id_msg] = array(
+						'id' => $id_msg,
+						'type' => $change_type,
+						'section' => $section,
+					);
+					if ($change_type == 'insert')
+						$context['changes']['insert' . $id_msg]['insert_value'] = $context[$section]['messages'][$id_msg];
+				}
+			}
+	}
+}
+
+// Actually and selectively split the topics out.
+function SplitSelectionExecute()
+{
+	global $txt, $board, $topic, $context, $user_info;
+
+	// Make sure the session id was passed with post.
+	checkSession();
+
+	// Default the subject in case it's blank.
+	if (!isset($_POST['subname']) || $_POST['subname'] == '')
+		$_POST['subname'] = $txt['new_topic'];
+
+	// You must've selected some messages!  Can't split out none!
+	if (empty($_SESSION['split_selection'][$topic]))
+		fatal_lang_error('no_posts_selected', false);
+
+	$context['old_topic'] = $topic;
+	$context['new_topic'] = splitTopic($topic, $_SESSION['split_selection'][$topic], $_POST['subname']);
+	$context['page_title'] = $txt['split'];
+}
+
+// Split a topic in two topics.
+function splitTopic($split1_ID_TOPIC, $splitMessages, $new_subject)
+{
+	global $user_info, $topic, $board, $modSettings, $smcFunc, $txt;
+
+	// Nothing to split?
+	if (empty($splitMessages))
+		fatal_lang_error('no_posts_selected', false);
+
+	// Get some board info.
+	$request = $smcFunc['db_query']('', '
+		SELECT id_board, approved
+		FROM {db_prefix}topics
+		WHERE id_topic = {int:id_topic}
+		LIMIT 1',
+		array(
+			'id_topic' => $split1_ID_TOPIC,
+		)
+	);
+	list ($id_board, $split1_approved) = $smcFunc['db_fetch_row']($request);
+	$smcFunc['db_free_result']($request);
+
+	// Find the new first and last not in the list. (old topic)
+	$request = $smcFunc['db_query']('', '
+		SELECT
+			MIN(m.id_msg) AS myid_first_msg, MAX(m.id_msg) AS myid_last_msg, COUNT(*) AS message_count, m.approved
+		FROM {db_prefix}messages AS m
+			INNER JOIN {db_prefix}topics AS t ON (t.id_topic = {int:id_topic})
+		WHERE m.id_msg NOT IN ({array_int:no_msg_list})
+			AND m.id_topic = {int:id_topic}
+		GROUP BY m.approved
+		ORDER BY m.approved DESC
+		LIMIT 2',
+		array(
+			'id_topic' => $split1_ID_TOPIC,
+			'no_msg_list' => $splitMessages,
+		)
+	);
+	// You can't select ALL the messages!
+	if ($smcFunc['db_num_rows']($request) == 0)
+		fatal_lang_error('selected_all_posts', false);
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+	{
+		// Get the right first and last message dependant on approved state...
+		if (empty($split1_first_msg) || $row['myid_first_msg'] < $split1_first_msg)
+			$split1_first_msg = $row['myid_first_msg'];
+		if (empty($split1_last_msg) || $row['approved'])
+			$split1_last_msg = $row['myid_last_msg'];
+
+		// Get the counts correct...
+		if ($row['approved'])
+		{
+			$split1_replies = $row['message_count'] - 1;
+			$split1_unapprovedposts = 0;
+		}
+		else
+		{
+			if (!isset($split1_replies))
+				$split1_replies = 0;
+			// If the topic isn't approved then num replies must go up by one... as first post wouldn't be counted.
+			elseif (!$split1_approved)
+				$split1_replies++;
+
+			$split1_unapprovedposts = $row['message_count'];
+		}
+	}
+	$smcFunc['db_free_result']($request);
+	$split1_firstMem = getMsgMemberID($split1_first_msg);
+	$split1_lastMem = getMsgMemberID($split1_last_msg);
+
+	// Find the first and last in the list. (new topic)
+	$request = $smcFunc['db_query']('', '
+		SELECT MIN(id_msg) AS myid_first_msg, MAX(id_msg) AS myid_last_msg, COUNT(*) AS message_count, approved
+		FROM {db_prefix}messages
+		WHERE id_msg IN ({array_int:msg_list})
+			AND id_topic = {int:id_topic}
+		GROUP BY id_topic, approved
+		ORDER BY approved DESC
+		LIMIT 2',
+		array(
+			'msg_list' => $splitMessages,
+			'id_topic' => $split1_ID_TOPIC,
+		)
+	);
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+	{
+		// As before get the right first and last message dependant on approved state...
+		if (empty($split2_first_msg) || $row['myid_first_msg'] < $split2_first_msg)
+			$split2_first_msg = $row['myid_first_msg'];
+		if (empty($split2_last_msg) || $row['approved'])
+			$split2_last_msg = $row['myid_last_msg'];
+
+		// Then do the counts again...
+		if ($row['approved'])
+		{
+			$split2_approved = true;
+			$split2_replies = $row['message_count'] - 1;
+			$split2_unapprovedposts = 0;
+		}
+		else
+		{
+			// Should this one be approved??
+			if ($split2_first_msg == $row['myid_first_msg'])
+				$split2_approved = false;
+
+			if (!isset($split2_replies))
+				$split2_replies = 0;
+			// As before, fix number of replies.
+			elseif (!$split2_approved)
+				$split2_replies++;
+
+			$split2_unapprovedposts = $row['message_count'];
+		}
+	}
+	$smcFunc['db_free_result']($request);
+	$split2_firstMem = getMsgMemberID($split2_first_msg);
+	$split2_lastMem = getMsgMemberID($split2_last_msg);
+
+	// No database changes yet, so let's double check to see if everything makes at least a little sense.
+	if ($split1_first_msg <= 0 || $split1_last_msg <= 0 || $split2_first_msg <= 0 || $split2_last_msg <= 0 || $split1_replies < 0 || $split2_replies < 0 || $split1_unapprovedposts < 0 || $split2_unapprovedposts < 0 || !isset($split1_approved) || !isset($split2_approved))
+		fatal_lang_error('cant_find_messages');
+
+	// You cannot split off the first message of a topic.
+	if ($split1_first_msg > $split2_first_msg)
+		fatal_lang_error('split_first_post', false);
+
+	// We're off to insert the new topic!  Use 0 for now to avoid UNIQUE errors.
+	$smcFunc['db_insert']('',
+			'{db_prefix}topics',
+			array(
+				'id_board' => 'int',
+				'id_member_started' => 'int',
+				'id_member_updated' => 'int',
+				'id_first_msg' => 'int',
+				'id_last_msg' => 'int',
+				'num_replies' => 'int',
+				'unapproved_posts' => 'int',
+				'approved' => 'int',
+				'is_sticky' => 'int',
+			),
+			array(
+				(int) $id_board, $split2_firstMem, $split2_lastMem, 0,
+				0, $split2_replies, $split2_unapprovedposts, (int) $split2_approved, 0,
+			),
+			array('id_topic')
+		);
+	$split2_ID_TOPIC = $smcFunc['db_insert_id']('{db_prefix}topics', 'id_topic');
+	if ($split2_ID_TOPIC <= 0)
+		fatal_lang_error('cant_insert_topic');
+
+	// Move the messages over to the other topic.
+	$new_subject = strtr($smcFunc['htmltrim']($smcFunc['htmlspecialchars']($new_subject)), array("\r" => '', "\n" => '', "\t" => ''));
+	// Check the subject length.
+	if ($smcFunc['strlen']($new_subject) > 100)
+		$new_subject = $smcFunc['substr']($new_subject, 0, 100);
+	// Valid subject?
+	if ($new_subject != '')
+	{
+		$smcFunc['db_query']('', '
+			UPDATE {db_prefix}messages
+			SET
+				id_topic = {int:id_topic},
+				subject = CASE WHEN id_msg = {int:split_first_msg} THEN {string:new_subject} ELSE {string:new_subject_replies} END
+			WHERE id_msg IN ({array_int:split_msgs})',
+			array(
+				'split_msgs' => $splitMessages,
+				'id_topic' => $split2_ID_TOPIC,
+				'new_subject' => $new_subject,
+				'split_first_msg' => $split2_first_msg,
+				'new_subject_replies' => $txt['response_prefix'] . $new_subject,
+			)
+		);
+
+		// Cache the new topics subject... we can do it now as all the subjects are the same!
+		updateStats('subject', $split2_ID_TOPIC, $new_subject);
+	}
+
+	// Any associated reported posts better follow...
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}log_reported
+		SET id_topic = {int:id_topic}
+		WHERE id_msg IN ({array_int:split_msgs})',
+		array(
+			'split_msgs' => $splitMessages,
+			'id_topic' => $split2_ID_TOPIC,
+		)
+	);
+
+	// Mess with the old topic's first, last, and number of messages.
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}topics
+		SET
+			num_replies = {int:num_replies},
+			id_first_msg = {int:id_first_msg},
+			id_last_msg = {int:id_last_msg},
+			id_member_started = {int:id_member_started},
+			id_member_updated = {int:id_member_updated},
+			unapproved_posts = {int:unapproved_posts}
+		WHERE id_topic = {int:id_topic}',
+		array(
+			'num_replies' => $split1_replies,
+			'id_first_msg' => $split1_first_msg,
+			'id_last_msg' => $split1_last_msg,
+			'id_member_started' => $split1_firstMem,
+			'id_member_updated' => $split1_lastMem,
+			'unapproved_posts' => $split1_unapprovedposts,
+			'id_topic' => $split1_ID_TOPIC,
+		)
+	);
+
+	// Now, put the first/last message back to what they should be.
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}topics
+		SET
+			id_first_msg = {int:id_first_msg},
+			id_last_msg = {int:id_last_msg}
+		WHERE id_topic = {int:id_topic}',
+		array(
+			'id_first_msg' => $split2_first_msg,
+			'id_last_msg' => $split2_last_msg,
+			'id_topic' => $split2_ID_TOPIC,
+		)
+	);
+
+	// If the new topic isn't approved ensure the first message flags this just in case.
+	if (!$split2_approved)
+		$smcFunc['db_query']('', '
+			UPDATE {db_prefix}messages
+			SET approved = {int:approved}
+			WHERE id_msg = {int:id_msg}
+				AND id_topic = {int:id_topic}',
+			array(
+				'approved' => 0,
+				'id_msg' => $split2_first_msg,
+				'id_topic' => $split2_ID_TOPIC,
+			)
+		);
+
+	// The board has more topics now (Or more unapproved ones!).
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}boards
+		SET ' . ($split2_approved ? '
+			num_topics = num_topics + 1' : '
+			unapproved_topics = unapproved_topics + 1') . '
+		WHERE id_board = {int:id_board}',
+		array(
+			'id_board' => $id_board,
+		)
+	);
+
+	// Copy log topic entries.
+	// !!! This should really be chunked.
+	$request = $smcFunc['db_query']('', '
+		SELECT id_member, id_msg
+		FROM {db_prefix}log_topics
+		WHERE id_topic = {int:id_topic}',
+		array(
+			'id_topic' => (int) $split1_ID_TOPIC,
+		)
+	);
+	if ($smcFunc['db_num_rows']($request) > 0)
+	{
+		$replaceEntries = array();
+		while ($row = $smcFunc['db_fetch_assoc']($request))
+			$replaceEntries[] = array($row['id_member'], $split2_ID_TOPIC, $row['id_msg']);
+
+		$smcFunc['db_insert']('ignore',
+			'{db_prefix}log_topics',
+			array('id_member' => 'int', 'id_topic' => 'int', 'id_msg' => 'int'),
+			$replaceEntries,
+			array('id_member', 'id_topic')
+		);
+		unset($replaceEntries);
+	}
+	$smcFunc['db_free_result']($request);
+
+	// Housekeeping.
+	updateStats('topic');
+	updateLastMessages($id_board);
+
+	logAction('split', array('topic' => $split1_ID_TOPIC, 'new_topic' => $split2_ID_TOPIC, 'board' => $id_board));
+
+	// Notify people that this topic has been split?
+	sendNotifications($split1_ID_TOPIC, 'split');
+
+	// Return the ID of the newly created topic.
+	return $split2_ID_TOPIC;
+}
+
+// Merge two topics into one topic... useful if they have the same basic subject.
+function MergeTopics()
+{
+	// Load the template....
+	loadTemplate('SplitTopics');
+
+	$subActions = array(
+		'done' => 'MergeDone',
+		'execute' => 'MergeExecute',
+		'index' => 'MergeIndex',
+		'options' => 'MergeExecute',
+	);
+
+	// ?action=mergetopics;sa=LETSBREAKIT won't work, sorry.
+	if (empty($_REQUEST['sa']) || !isset($subActions[$_REQUEST['sa']]))
+		MergeIndex();
+	else
+		$subActions[$_REQUEST['sa']]();
+}
+
+// Merge two topics together.
+function MergeIndex()
+{
+	global $txt, $board, $context, $smcFunc;
+	global $scripturl, $topic, $user_info, $modSettings;
+
+	if (!isset($_GET['from']))
+		fatal_lang_error('no_access', false);
+	$_GET['from'] = (int) $_GET['from'];
+
+	$_REQUEST['targetboard'] = isset($_REQUEST['targetboard']) ? (int) $_REQUEST['targetboard'] : $board;
+	$context['target_board'] = $_REQUEST['targetboard'];
+
+	// Prepare a handy query bit for approval...
+	if ($modSettings['postmod_active'])
+	{
+		$can_approve_boards = boardsAllowedTo('approve_posts');
+		$onlyApproved = $can_approve_boards !== array(0) && !in_array($_REQUEST['targetboard'], $can_approve_boards);
+	}
+	else
+		$onlyApproved = false;
+
+	// How many topics are on this board?  (used for paging.)
+	$request = $smcFunc['db_query']('', '
+		SELECT COUNT(*)
+		FROM {db_prefix}topics AS t
+		WHERE t.id_board = {int:id_board}' . ($onlyApproved ? '
+			AND t.approved = {int:is_approved}' : ''),
+		array(
+			'id_board' => $_REQUEST['targetboard'],
+			'is_approved' => 1,
+		)
+	);
+	list ($topiccount) = $smcFunc['db_fetch_row']($request);
+	$smcFunc['db_free_result']($request);
+
+	// Make the page list.
+	$context['page_index'] = constructPageIndex($scripturl . '?action=mergetopics;from=' . $_GET['from'] . ';targetboard=' . $_REQUEST['targetboard'] . ';board=' . $board . '.%1$d', $_REQUEST['start'], $topiccount, $modSettings['defaultMaxTopics'], true);
+
+	// Get the topic's subject.
+	$request = $smcFunc['db_query']('', '
+		SELECT m.subject
+		FROM {db_prefix}topics AS t
+			INNER JOIN {db_prefix}messages AS m ON (m.id_msg = t.id_first_msg)
+		WHERE t.id_topic = {int:id_topic}
+			AND t.id_board = {int:current_board}' . ($onlyApproved ? '
+			AND t.approved = {int:is_approved}' : '') . '
+		LIMIT 1',
+		array(
+			'current_board' => $board,
+			'id_topic' => $_GET['from'],
+			'is_approved' => 1,
+		)
+	);
+	if ($smcFunc['db_num_rows']($request) == 0)
+		fatal_lang_error('no_board');
+	list ($subject) = $smcFunc['db_fetch_row']($request);
+	$smcFunc['db_free_result']($request);
+
+	// Tell the template a few things..
+	$context['origin_topic'] = $_GET['from'];
+	$context['origin_subject'] = $subject;
+	$context['origin_js_subject'] = addcslashes(addslashes($subject), '/');
+	$context['page_title'] = $txt['merge'];
+
+	// Check which boards you have merge permissions on.
+	$merge_boards = boardsAllowedTo('merge_any');
+
+	if (empty($merge_boards))
+		fatal_lang_error('cannot_merge_any', 'user');
+
+	// Get a list of boards they can navigate to to merge.
+	$request = $smcFunc['db_query']('order_by_board_order', '
+		SELECT b.id_board, b.name AS board_name, c.name AS cat_name
+		FROM {db_prefix}boards AS b
+			LEFT JOIN {db_prefix}categories AS c ON (c.id_cat = b.id_cat)
+		WHERE {query_see_board}' . (!in_array(0, $merge_boards) ? '
+			AND b.id_board IN ({array_int:merge_boards})' : ''),
+		array(
+			'merge_boards' => $merge_boards,
+		)
+	);
+	$context['boards'] = array();
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+		$context['boards'][] = array(
+			'id' => $row['id_board'],
+			'name' => $row['board_name'],
+			'category' => $row['cat_name']
+		);
+	$smcFunc['db_free_result']($request);
+
+	// Get some topics to merge it with.
+	$request = $smcFunc['db_query']('', '
+		SELECT t.id_topic, m.subject, m.id_member, IFNULL(mem.real_name, m.poster_name) AS poster_name
+		FROM {db_prefix}topics AS t
+			INNER JOIN {db_prefix}messages AS m ON (m.id_msg = t.id_first_msg)
+			LEFT JOIN {db_prefix}members AS mem ON (mem.id_member = m.id_member)
+		WHERE t.id_board = {int:id_board}
+			AND t.id_topic != {int:id_topic}' . ($onlyApproved ? '
+			AND t.approved = {int:is_approved}' : '') . '
+		ORDER BY {raw:sort}
+		LIMIT {int:offset}, {int:limit}',
+		array(
+			'id_board' => $_REQUEST['targetboard'],
+			'id_topic' => $_GET['from'],
+			'sort' => (!empty($modSettings['enableStickyTopics']) ? 't.is_sticky DESC, ' : '') . 't.id_last_msg DESC',
+			'offset' => $_REQUEST['start'],
+			'limit' => $modSettings['defaultMaxTopics'],
+			'is_approved' => 1,
+		)
+	);
+	$context['topics'] = array();
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+	{
+		censorText($row['subject']);
+
+		$context['topics'][] = array(
+			'id' => $row['id_topic'],
+			'poster' => array(
+				'id' => $row['id_member'],
+				'name' => $row['poster_name'],
+				'href' => empty($row['id_member']) ? '' : $scripturl . '?action=profile;u=' . $row['id_member'],
+				'link' => empty($row['id_member']) ? $row['poster_name'] : '<a href="' . $scripturl . '?action=profile;u=' . $row['id_member'] . '" target="_blank" class="new_win">' . $row['poster_name'] . '</a>'
+			),
+			'subject' => $row['subject'],
+			'js_subject' => addcslashes(addslashes($row['subject']), '/')
+		);
+	}
+	$smcFunc['db_free_result']($request);
+
+	if (empty($context['topics']) && count($context['boards']) <= 1)
+		fatal_lang_error('merge_need_more_topics');
+
+	$context['sub_template'] = 'merge';
+}
+
+// Now that the topic IDs are known, do the proper merging.
+function MergeExecute($topics = array())
+{
+	global $user_info, $txt, $context, $scripturl, $sourcedir;
+	global $smcFunc, $language, $modSettings;
+
+	// Check the session.
+	checkSession('request');
+
+	// Handle URLs from MergeIndex.
+	if (!empty($_GET['from']) && !empty($_GET['to']))
+		$topics = array((int) $_GET['from'], (int) $_GET['to']);
+
+	// If we came from a form, the topic IDs came by post.
+	if (!empty($_POST['topics']) && is_array($_POST['topics']))
+		$topics = $_POST['topics'];
+
+	// There's nothing to merge with just one topic...
+	if (empty($topics) || !is_array($topics) || count($topics) == 1)
+		fatal_lang_error('merge_need_more_topics');
+
+	// Make sure every topic is numeric, or some nasty things could be done with the DB.
+	foreach ($topics as $id => $topic)
+		$topics[$id] = (int) $topic;
+
+	// Joy of all joys, make sure they're not pi**ing about with unapproved topics they can't see :P
+	if ($modSettings['postmod_active'])
+		$can_approve_boards = boardsAllowedTo('approve_posts');
+
+	// Get info about the topics and polls that will be merged.
+	$request = $smcFunc['db_query']('', '
+		SELECT
+			t.id_topic, t.id_board, t.id_poll, t.num_views, t.is_sticky, t.approved, t.num_replies, t.unapproved_posts,
+			m1.subject, m1.poster_time AS time_started, IFNULL(mem1.id_member, 0) AS id_member_started, IFNULL(mem1.real_name, m1.poster_name) AS name_started,
+			m2.poster_time AS time_updated, IFNULL(mem2.id_member, 0) AS id_member_updated, IFNULL(mem2.real_name, m2.poster_name) AS name_updated
+		FROM {db_prefix}topics AS t
+			INNER JOIN {db_prefix}messages AS m1 ON (m1.id_msg = t.id_first_msg)
+			INNER JOIN {db_prefix}messages AS m2 ON (m2.id_msg = t.id_last_msg)
+			LEFT JOIN {db_prefix}members AS mem1 ON (mem1.id_member = m1.id_member)
+			LEFT JOIN {db_prefix}members AS mem2 ON (mem2.id_member = m2.id_member)
+		WHERE t.id_topic IN ({array_int:topic_list})
+		ORDER BY t.id_first_msg
+		LIMIT ' . count($topics),
+		array(
+			'topic_list' => $topics,
+		)
+	);
+	if ($smcFunc['db_num_rows']($request) < 2)
+		fatal_lang_error('no_topic_id');
+	$num_views = 0;
+	$is_sticky = 0;
+	$boardTotals = array();
+	$boards = array();
+	$polls = array();
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+	{
+		// Make a note for the board counts...
+		if (!isset($boardTotals[$row['id_board']]))
+			$boardTotals[$row['id_board']] = array(
+				'posts' => 0,
+				'topics' => 0,
+				'unapproved_posts' => 0,
+				'unapproved_topics' => 0
+			);
+
+		// We can't see unapproved topics here?
+		if ($modSettings['postmod_active'] && !$row['approved'] && $can_approve_boards != array(0) && in_array($row['id_board'], $can_approve_boards))
+			continue;
+		elseif (!$row['approved'])
+			$boardTotals[$row['id_board']]['unapproved_topics']++;
+		else
+			$boardTotals[$row['id_board']]['topics']++;
+
+		$boardTotals[$row['id_board']]['unapproved_posts'] += $row['unapproved_posts'];
+		$boardTotals[$row['id_board']]['posts'] += $row['num_replies'] + ($row['approved'] ? 1 : 0);
+
+		$topic_data[$row['id_topic']] = array(
+			'id' => $row['id_topic'],
+			'board' => $row['id_board'],
+			'poll' => $row['id_poll'],
+			'num_views' => $row['num_views'],
+			'subject' => $row['subject'],
+			'started' => array(
+				'time' => timeformat($row['time_started']),
+				'timestamp' => forum_time(true, $row['time_started']),
+				'href' => empty($row['id_member_started']) ? '' : $scripturl . '?action=profile;u=' . $row['id_member_started'],
+				'link' => empty($row['id_member_started']) ? $row['name_started'] : '<a href="' . $scripturl . '?action=profile;u=' . $row['id_member_started'] . '">' . $row['name_started'] . '</a>'
+			),
+			'updated' => array(
+				'time' => timeformat($row['time_updated']),
+				'timestamp' => forum_time(true, $row['time_updated']),
+				'href' => empty($row['id_member_updated']) ? '' : $scripturl . '?action=profile;u=' . $row['id_member_updated'],
+				'link' => empty($row['id_member_updated']) ? $row['name_updated'] : '<a href="' . $scripturl . '?action=profile;u=' . $row['id_member_updated'] . '">' . $row['name_updated'] . '</a>'
+			)
+		);
+		$num_views += $row['num_views'];
+		$boards[] = $row['id_board'];
+
+		// If there's no poll, id_poll == 0...
+		if ($row['id_poll'] > 0)
+			$polls[] = $row['id_poll'];
+		// Store the id_topic with the lowest id_first_msg.
+		if (empty($firstTopic))
+			$firstTopic = $row['id_topic'];
+
+		$is_sticky = max($is_sticky, $row['is_sticky']);
+	}
+	$smcFunc['db_free_result']($request);
+
+	// If we didn't get any topics then they've been messing with unapproved stuff.
+	if (empty($topic_data))
+		fatal_lang_error('no_topic_id');
+
+	$boards = array_values(array_unique($boards));
+
+	// The parameters of MergeExecute were set, so this must've been an internal call.
+	if (!empty($topics))
+	{
+		isAllowedTo('merge_any', $boards);
+		loadTemplate('SplitTopics');
+	}
+
+	// Get the boards a user is allowed to merge in.
+	$merge_boards = boardsAllowedTo('merge_any');
+	if (empty($merge_boards))
+		fatal_lang_error('cannot_merge_any', 'user');
+
+	// Make sure they can see all boards....
+	$request = $smcFunc['db_query']('', '
+		SELECT b.id_board
+		FROM {db_prefix}boards AS b
+		WHERE b.id_board IN ({array_int:boards})
+			AND {query_see_board}' . (!in_array(0, $merge_boards) ? '
+			AND b.id_board IN ({array_int:merge_boards})' : '') . '
+		LIMIT ' . count($boards),
+		array(
+			'boards' => $boards,
+			'merge_boards' => $merge_boards,
+		)
+	);
+	// If the number of boards that's in the output isn't exactly the same as we've put in there, you're in trouble.
+	if ($smcFunc['db_num_rows']($request) != count($boards))
+		fatal_lang_error('no_board');
+	$smcFunc['db_free_result']($request);
+
+	if (empty($_REQUEST['sa']) || $_REQUEST['sa'] == 'options')
+	{
+		if (count($polls) > 1)
+		{
+			$request = $smcFunc['db_query']('', '
+				SELECT t.id_topic, t.id_poll, m.subject, p.question
+				FROM {db_prefix}polls AS p
+					INNER JOIN {db_prefix}topics AS t ON (t.id_poll = p.id_poll)
+					INNER JOIN {db_prefix}messages AS m ON (m.id_msg = t.id_first_msg)
+				WHERE p.id_poll IN ({array_int:polls})
+				LIMIT ' . count($polls),
+				array(
+					'polls' => $polls,
+				)
+			);
+			while ($row = $smcFunc['db_fetch_assoc']($request))
+				$context['polls'][] = array(
+					'id' => $row['id_poll'],
+					'topic' => array(
+						'id' => $row['id_topic'],
+						'subject' => $row['subject']
+					),
+					'question' => $row['question'],
+					'selected' => $row['id_topic'] == $firstTopic
+				);
+			$smcFunc['db_free_result']($request);
+		}
+		if (count($boards) > 1)
+		{
+			$request = $smcFunc['db_query']('', '
+				SELECT id_board, name
+				FROM {db_prefix}boards
+				WHERE id_board IN ({array_int:boards})
+				ORDER BY name
+				LIMIT ' . count($boards),
+				array(
+					'boards' => $boards,
+				)
+			);
+			while ($row = $smcFunc['db_fetch_assoc']($request))
+				$context['boards'][] = array(
+					'id' => $row['id_board'],
+					'name' => $row['name'],
+					'selected' => $row['id_board'] == $topic_data[$firstTopic]['board']
+				);
+			$smcFunc['db_free_result']($request);
+		}
+
+		$context['topics'] = $topic_data;
+		foreach ($topic_data as $id => $topic)
+			$context['topics'][$id]['selected'] = $topic['id'] == $firstTopic;
+
+		$context['page_title'] = $txt['merge'];
+		$context['sub_template'] = 'merge_extra_options';
+		return;
+	}
+
+	// Determine target board.
+	$target_board = count($boards) > 1 ? (int) $_REQUEST['board'] : $boards[0];
+	if (!in_array($target_board, $boards))
+		fatal_lang_error('no_board');
+
+	// Determine which poll will survive and which polls won't.
+	$target_poll = count($polls) > 1 ? (int) $_POST['poll'] : (count($polls) == 1 ? $polls[0] : 0);
+	if ($target_poll > 0 && !in_array($target_poll, $polls))
+		fatal_lang_error('no_access', false);
+	$deleted_polls = empty($target_poll) ? $polls : array_diff($polls, array($target_poll));
+
+	// Determine the subject of the newly merged topic - was a custom subject specified?
+	if (empty($_POST['subject']) && isset($_POST['custom_subject']) && $_POST['custom_subject'] != '')
+	{
+		$target_subject = strtr($smcFunc['htmltrim']($smcFunc['htmlspecialchars']($_POST['custom_subject'])), array("\r" => '', "\n" => '', "\t" => ''));
+		// Keep checking the length.
+		if ($smcFunc['strlen']($target_subject) > 100)
+			$target_subject = $smcFunc['substr']($target_subject, 0, 100);
+
+		// Nothing left - odd but pick the first topics subject.
+		if ($target_subject == '')
+			$target_subject = $topic_data[$firstTopic]['subject'];
+	}
+	// A subject was selected from the list.
+	elseif (!empty($topic_data[(int) $_POST['subject']]['subject']))
+		$target_subject = $topic_data[(int) $_POST['subject']]['subject'];
+	// Nothing worked? Just take the subject of the first message.
+	else
+		$target_subject = $topic_data[$firstTopic]['subject'];
+
+	// Get the first and last message and the number of messages....
+	$request = $smcFunc['db_query']('', '
+		SELECT approved, MIN(id_msg) AS first_msg, MAX(id_msg) AS last_msg, COUNT(*) AS message_count
+		FROM {db_prefix}messages
+		WHERE id_topic IN ({array_int:topics})
+		GROUP BY approved
+		ORDER BY approved DESC',
+		array(
+			'topics' => $topics,
+		)
+	);
+	$topic_approved = 1;
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+	{
+		// If this is approved, or is fully unapproved.
+		if ($row['approved'] || !isset($first_msg))
+		{
+			$first_msg = $row['first_msg'];
+			$last_msg = $row['last_msg'];
+			if ($row['approved'])
+			{
+				$num_replies = $row['message_count'] - 1;
+				$num_unapproved = 0;
+			}
+			else
+			{
+				$topic_approved = 0;
+				$num_replies = 0;
+				$num_unapproved = $row['message_count'];
+			}
+		}
+		else
+		{
+			// If this has a lower first_msg then the first post is not approved and hence the number of replies was wrong!
+			if ($first_msg > $row['first_msg'])
+			{
+				$first_msg = $row['first_msg'];
+				$num_replies++;
+				$topic_approved = 0;
+			}
+			$num_unapproved = $row['message_count'];
+		}
+	}
+	$smcFunc['db_free_result']($request);
+
+	// Ensure we have a board stat for the target board.
+	if (!isset($boardTotals[$target_board]))
+	{
+		$boardTotals[$target_board] = array(
+			'posts' => 0,
+			'topics' => 0,
+			'unapproved_posts' => 0,
+			'unapproved_topics' => 0
+		);
+	}
+
+	// Fix the topic count stuff depending on what the new one counts as.
+	if ($topic_approved)
+		$boardTotals[$target_board]['topics']--;
+	else
+		$boardTotals[$target_board]['unapproved_topics']--;
+
+	$boardTotals[$target_board]['unapproved_posts'] -= $num_unapproved;
+	$boardTotals[$target_board]['posts'] -= $topic_approved ? $num_replies + 1 : $num_replies;
+
+	// Get the member ID of the first and last message.
+	$request = $smcFunc['db_query']('', '
+		SELECT id_member
+		FROM {db_prefix}messages
+		WHERE id_msg IN ({int:first_msg}, {int:last_msg})
+		ORDER BY id_msg
+		LIMIT 2',
+		array(
+			'first_msg' => $first_msg,
+			'last_msg' => $last_msg,
+		)
+	);
+	list ($member_started) = $smcFunc['db_fetch_row']($request);
+	list ($member_updated) = $smcFunc['db_fetch_row']($request);
+	// First and last message are the same, so only row was returned.
+	if ($member_updated === NULL)
+		$member_updated = $member_started;
+
+	$smcFunc['db_free_result']($request);
+
+	// Assign the first topic ID to be the merged topic.
+	$id_topic = min($topics);
+
+	// Delete the remaining topics.
+	$deleted_topics = array_diff($topics, array($id_topic));
+	$smcFunc['db_query']('', '
+		DELETE FROM {db_prefix}topics
+		WHERE id_topic IN ({array_int:deleted_topics})',
+		array(
+			'deleted_topics' => $deleted_topics,
+		)
+	);
+	$smcFunc['db_query']('', '
+		DELETE FROM {db_prefix}log_search_subjects
+		WHERE id_topic IN ({array_int:deleted_topics})',
+		array(
+			'deleted_topics' => $deleted_topics,
+		)
+	);
+
+	// Asssign the properties of the newly merged topic.
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}topics
+		SET
+			id_board = {int:id_board},
+			id_member_started = {int:id_member_started},
+			id_member_updated = {int:id_member_updated},
+			id_first_msg = {int:id_first_msg},
+			id_last_msg = {int:id_last_msg},
+			id_poll = {int:id_poll},
+			num_replies = {int:num_replies},
+			unapproved_posts = {int:unapproved_posts},
+			num_views = {int:num_views},
+			is_sticky = {int:is_sticky},
+			approved = {int:approved}
+		WHERE id_topic = {int:id_topic}',
+		array(
+			'id_board' => $target_board,
+			'is_sticky' => $is_sticky,
+			'approved' => $topic_approved,
+			'id_topic' => $id_topic,
+			'id_member_started' => $member_started,
+			'id_member_updated' => $member_updated,
+			'id_first_msg' => $first_msg,
+			'id_last_msg' => $last_msg,
+			'id_poll' => $target_poll,
+			'num_replies' => $num_replies,
+			'unapproved_posts' => $num_unapproved,
+			'num_views' => $num_views,
+		)
+	);
+
+	// Grab the response prefix (like 'Re: ') in the default forum language.
+	if (!isset($context['response_prefix']) && !($context['response_prefix'] = cache_get_data('response_prefix')))
+	{
+		if ($language === $user_info['language'])
+			$context['response_prefix'] = $txt['response_prefix'];
+		else
+		{
+			loadLanguage('index', $language, false);
+			$context['response_prefix'] = $txt['response_prefix'];
+			loadLanguage('index');
+		}
+		cache_put_data('response_prefix', $context['response_prefix'], 600);
+	}
+
+	// Change the topic IDs of all messages that will be merged.  Also adjust subjects if 'enforce subject' was checked.
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}messages
+		SET
+			id_topic = {int:id_topic},
+			id_board = {int:target_board}' . (empty($_POST['enforce_subject']) ? '' : ',
+			subject = {string:subject}') . '
+		WHERE id_topic IN ({array_int:topic_list})',
+		array(
+			'topic_list' => $topics,
+			'id_topic' => $id_topic,
+			'target_board' => $target_board,
+			'subject' => $context['response_prefix'] . $target_subject,
+		)
+	);
+
+	// Any reported posts should reflect the new board.
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}log_reported
+		SET
+			id_topic = {int:id_topic},
+			id_board = {int:target_board}
+		WHERE id_topic IN ({array_int:topics_list})',
+		array(
+			'topics_list' => $topics,
+			'id_topic' => $id_topic,
+			'target_board' => $target_board,
+		)
+	);
+
+	// Change the subject of the first message...
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}messages
+		SET subject = {string:target_subject}
+		WHERE id_msg = {int:first_msg}',
+		array(
+			'first_msg' => $first_msg,
+			'target_subject' => $target_subject,
+		)
+	);
+
+	// Adjust all calendar events to point to the new topic.
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}calendar
+		SET
+			id_topic = {int:id_topic},
+			id_board = {int:target_board}
+		WHERE id_topic IN ({array_int:deleted_topics})',
+		array(
+			'deleted_topics' => $deleted_topics,
+			'id_topic' => $id_topic,
+			'target_board' => $target_board,
+		)
+	);
+
+	// Merge log topic entries.
+	$request = $smcFunc['db_query']('', '
+		SELECT id_member, MIN(id_msg) AS new_id_msg
+		FROM {db_prefix}log_topics
+		WHERE id_topic IN ({array_int:topics})
+		GROUP BY id_member',
+		array(
+			'topics' => $topics,
+		)
+	);
+	if ($smcFunc['db_num_rows']($request) > 0)
+	{
+		$replaceEntries = array();
+		while ($row = $smcFunc['db_fetch_assoc']($request))
+			$replaceEntries[] = array($row['id_member'], $id_topic, $row['new_id_msg']);
+
+		$smcFunc['db_insert']('replace',
+			'{db_prefix}log_topics',
+			array('id_member' => 'int', 'id_topic' => 'int', 'id_msg' => 'int'),
+			$replaceEntries,
+			array('id_member', 'id_topic')
+		);
+		unset($replaceEntries);
+
+		// Get rid of the old log entries.
+		$smcFunc['db_query']('', '
+			DELETE FROM {db_prefix}log_topics
+			WHERE id_topic IN ({array_int:deleted_topics})',
+			array(
+				'deleted_topics' => $deleted_topics,
+			)
+		);
+	}
+	$smcFunc['db_free_result']($request);
+
+	// Merge topic notifications.
+	$notifications = isset($_POST['notifications']) && is_array($_POST['notifications']) ? array_intersect($topics, $_POST['notifications']) : array();
+	if (!empty($notifications))
+	{
+		$request = $smcFunc['db_query']('', '
+			SELECT id_member, MAX(sent) AS sent
+			FROM {db_prefix}log_notify
+			WHERE id_topic IN ({array_int:topics_list})
+			GROUP BY id_member',
+			array(
+				'topics_list' => $notifications,
+			)
+		);
+		if ($smcFunc['db_num_rows']($request) > 0)
+		{
+			$replaceEntries = array();
+			while ($row = $smcFunc['db_fetch_assoc']($request))
+				$replaceEntries[] = array($row['id_member'], $id_topic, 0, $row['sent']);
+
+			$smcFunc['db_insert']('replace',
+					'{db_prefix}log_notify',
+					array('id_member' => 'int', 'id_topic' => 'int', 'id_board' => 'int', 'sent' => 'int'),
+					$replaceEntries,
+					array('id_member', 'id_topic', 'id_board')
+				);
+			unset($replaceEntries);
+
+			$smcFunc['db_query']('', '
+				DELETE FROM {db_prefix}log_topics
+				WHERE id_topic IN ({array_int:deleted_topics})',
+				array(
+					'deleted_topics' => $deleted_topics,
+				)
+			);
+		}
+		$smcFunc['db_free_result']($request);
+	}
+
+	// Get rid of the redundant polls.
+	if (!empty($deleted_polls))
+	{
+		$smcFunc['db_query']('', '
+			DELETE FROM {db_prefix}polls
+			WHERE id_poll IN ({array_int:deleted_polls})',
+			array(
+				'deleted_polls' => $deleted_polls,
+			)
+		);
+		$smcFunc['db_query']('', '
+			DELETE FROM {db_prefix}poll_choices
+			WHERE id_poll IN ({array_int:deleted_polls})',
+			array(
+				'deleted_polls' => $deleted_polls,
+			)
+		);
+		$smcFunc['db_query']('', '
+			DELETE FROM {db_prefix}log_polls
+			WHERE id_poll IN ({array_int:deleted_polls})',
+			array(
+				'deleted_polls' => $deleted_polls,
+			)
+		);
+	}
+
+	// Cycle through each board...
+	foreach ($boardTotals as $id_board => $stats)
+	{
+		$smcFunc['db_query']('', '
+			UPDATE {db_prefix}boards
+			SET
+				num_topics = CASE WHEN {int:topics} > num_topics THEN 0 ELSE num_topics - {int:topics} END,
+				unapproved_topics = CASE WHEN {int:unapproved_topics} > unapproved_topics THEN 0 ELSE unapproved_topics - {int:unapproved_topics} END,
+				num_posts = CASE WHEN {int:posts} > num_posts THEN 0 ELSE num_posts - {int:posts} END,
+				unapproved_posts = CASE WHEN {int:unapproved_posts} > unapproved_posts THEN 0 ELSE unapproved_posts - {int:unapproved_posts} END
+			WHERE id_board = {int:id_board}',
+			array(
+				'id_board' => $id_board,
+				'topics' => $stats['topics'],
+				'unapproved_topics' => $stats['unapproved_topics'],
+				'posts' => $stats['posts'],
+				'unapproved_posts' => $stats['unapproved_posts'],
+			)
+		);
+	}
+
+	// Determine the board the final topic resides in
+	$request = $smcFunc['db_query']('', '
+		SELECT id_board
+		FROM {db_prefix}topics
+		WHERE id_topic = {int:id_topic}
+		LIMIT 1',
+		array(
+			'id_topic' => $id_topic,
+		)
+	);
+	list($id_board) = $smcFunc['db_fetch_row']($request);
+	$smcFunc['db_free_result']($request);
+
+	require_once($sourcedir . '/Subs-Post.php');
+
+	// Update all the statistics.
+	updateStats('topic');
+	updateStats('subject', $id_topic, $target_subject);
+	updateLastMessages($boards);
+
+	logAction('merge', array('topic' => $id_topic, 'board' => $id_board));
+
+	// Notify people that these topics have been merged?
+	sendNotifications($id_topic, 'merge');
+
+	// Send them to the all done page.
+	redirectexit('action=mergetopics;sa=done;to=' . $id_topic . ';targetboard=' . $target_board);
+}
+
+// Tell the user the move was done properly.
+function MergeDone()
+{
+	global $txt, $context;
+
+	// Make sure the template knows everything...
+	$context['target_board'] = (int) $_GET['targetboard'];
+	$context['target_topic'] = (int) $_GET['to'];
+
+	$context['page_title'] = $txt['merge'];
+	$context['sub_template'] = 'merge_done';
+}
+
+?>
\ No newline at end of file