9 files changed, 197 insertions, 21 deletions
diff --git a/phpBB/includes/acp/acp_ranks.php b/phpBB/includes/acp/acp_ranks.php
index dfd7511427..ea057cd84c 100644
--- a/phpBB/includes/acp/acp_ranks.php
+++ b/phpBB/includes/acp/acp_ranks.php
@@ -52,7 +52,7 @@ class acp_ranks
 				}
 				$rank_title = utf8_normalize_nfc(request_var('title', '', true));
 				$special_rank = request_var('special_rank', 0);
-				$min_posts = ($special_rank) ? 0 : request_var('min_posts', 0);
+				$min_posts = ($special_rank) ? 0 : max(0, request_var('min_posts', 0));
 				$rank_image = request_var('rank_image', '');
 
 				// The rank image has to be a jpg, gif or png
diff --git a/phpBB/includes/db/dbal.php b/phpBB/includes/db/dbal.php
index 230c9c8ed7..5d456c2ff0 100644
--- a/phpBB/includes/db/dbal.php
+++ b/phpBB/includes/db/dbal.php
@@ -900,6 +900,41 @@ class dbal
 
 		return true;
 	}
+
+	/**
+	* Gets the estimated number of rows in a specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return string				Number of rows in $table_name.
+	*								Prefixed with ~ if estimated (otherwise exact).
+	*
+	* @access public
+	*/
+	function get_estimated_row_count($table_name)
+	{
+		return $this->get_row_count($table_name);
+	}
+
+	/**
+	* Gets the exact number of rows in a specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return string				Exact number of rows in $table_name.
+	*
+	* @access public
+	*/
+	function get_row_count($table_name)
+	{
+		$sql = 'SELECT COUNT(*) AS rows_total
+			FROM ' . $this->sql_escape($table_name);
+		$result = $this->sql_query($sql);
+		$rows_total = $this->sql_fetchfield('rows_total');
+		$this->sql_freeresult($result);
+
+		return $rows_total;
+	}
 }
 
 /**
diff --git a/phpBB/includes/db/mysql.php b/phpBB/includes/db/mysql.php
index 1e24c79577..1ccb785150 100644
--- a/phpBB/includes/db/mysql.php
+++ b/phpBB/includes/db/mysql.php
@@ -319,6 +319,76 @@ class dbal_mysql extends dbal
 	}
 
 	/**
+	* Gets the estimated number of rows in a specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return string				Number of rows in $table_name.
+	*								Prefixed with ~ if estimated (otherwise exact).
+	*
+	* @access public
+	*/
+	function get_estimated_row_count($table_name)
+	{
+		$table_status = $this->get_table_status($table_name);
+
+		if (isset($table_status['Engine']))
+		{
+			if ($table_status['Engine'] === 'MyISAM')
+			{
+				return $table_status['Rows'];
+			}
+			else if ($table_status['Engine'] === 'InnoDB' && $table_status['Rows'] > 100000)
+			{
+				return '~' . $table_status['Rows'];
+			}
+		}
+
+		return parent::get_row_count($table_name);
+	}
+
+	/**
+	* Gets the exact number of rows in a specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return string				Exact number of rows in $table_name.
+	*
+	* @access public
+	*/
+	function get_row_count($table_name)
+	{
+		$table_status = $this->get_table_status($table_name);
+
+		if (isset($table_status['Engine']) && $table_status['Engine'] === 'MyISAM')
+		{
+			return $table_status['Rows'];
+		}
+
+		return parent::get_row_count($table_name);
+	}
+
+	/**
+	* Gets some information about the specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return array
+	*
+	* @access protected
+	*/
+	function get_table_status($table_name)
+	{
+		$sql = "SHOW TABLE STATUS
+			LIKE '" . $this->sql_escape($table_name) . "'";
+		$result = $this->sql_query($sql);
+		$table_status = $this->sql_fetchrow($result);
+		$this->sql_freeresult($result);
+
+		return $table_status;
+	}
+
+	/**
 	* Build LIKE expression
 	* @access private
 	*/
diff --git a/phpBB/includes/db/mysqli.php b/phpBB/includes/db/mysqli.php
index 456ce906d0..a311b8cda6 100644
--- a/phpBB/includes/db/mysqli.php
+++ b/phpBB/includes/db/mysqli.php
@@ -316,6 +316,76 @@ class dbal_mysqli extends dbal
 	}
 
 	/**
+	* Gets the estimated number of rows in a specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return string				Number of rows in $table_name.
+	*								Prefixed with ~ if estimated (otherwise exact).
+	*
+	* @access public
+	*/
+	function get_estimated_row_count($table_name)
+	{
+		$table_status = $this->get_table_status($table_name);
+
+		if (isset($table_status['Engine']))
+		{
+			if ($table_status['Engine'] === 'MyISAM')
+			{
+				return $table_status['Rows'];
+			}
+			else if ($table_status['Engine'] === 'InnoDB' && $table_status['Rows'] > 100000)
+			{
+				return '~' . $table_status['Rows'];
+			}
+		}
+
+		return parent::get_row_count($table_name);
+	}
+
+	/**
+	* Gets the exact number of rows in a specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return string				Exact number of rows in $table_name.
+	*
+	* @access public
+	*/
+	function get_row_count($table_name)
+	{
+		$table_status = $this->get_table_status($table_name);
+
+		if (isset($table_status['Engine']) && $table_status['Engine'] === 'MyISAM')
+		{
+			return $table_status['Rows'];
+		}
+
+		return parent::get_row_count($table_name);
+	}
+
+	/**
+	* Gets some information about the specified table.
+	*
+	* @param string $table_name		Table name
+	*
+	* @return array
+	*
+	* @access protected
+	*/
+	function get_table_status($table_name)
+	{
+		$sql = "SHOW TABLE STATUS
+			LIKE '" . $this->sql_escape($table_name) . "'";
+		$result = $this->sql_query($sql);
+		$table_status = $this->sql_fetchrow($result);
+		$this->sql_freeresult($result);
+
+		return $table_status;
+	}
+
+	/**
 	* Build LIKE expression
 	* @access private
 	*/
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 4d2a00f2db..0320230a7d 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -4553,7 +4553,7 @@ function page_header($page_title = '', $display_online_list = true, $item_id = 0
 		foreach ($_EXTRA_URL as $url_param)
 		{
 			$url_param = explode('=', $url_param, 2);
-			$s_hidden_fields[$url_param[0]] = $url_param[1];
+			$s_search_hidden_fields[$url_param[0]] = $url_param[1];
 		}
 	}
 
diff --git a/phpBB/includes/functions_posting.php b/phpBB/includes/functions_posting.php
index 77d92e26e2..f920be9c4b 100644
--- a/phpBB/includes/functions_posting.php
+++ b/phpBB/includes/functions_posting.php
@@ -1286,6 +1286,20 @@ function user_notification($mode, $subject, $topic_title, $forum_name, $forum_id
 		{
 			$msg_users[] = $row;
 			$update_notification[$row['notify_type']][] = $row['user_id'];
+
+			/*
+			* We also update the forums watch table for this user when we are
+			* sending out a topic notification to prevent sending out another
+			* notification in case this user is also subscribed to the forum
+			* this topic was posted in.
+			* Since an UPDATE query is used, this has no effect on users only
+			* subscribed to the topic (i.e. no row is created) and should not
+			* be a performance issue.
+			*/
+			if ($row['notify_type'] === 'topic')
+			{
+				$update_notification['forum'][] = $row['user_id'];
+			}
 		}
 	}
 	unset($notify_rows);
diff --git a/phpBB/includes/search/fulltext_mysql.php b/phpBB/includes/search/fulltext_mysql.php
index 29cdd8ee9a..779ec1d216 100644
--- a/phpBB/includes/search/fulltext_mysql.php
+++ b/phpBB/includes/search/fulltext_mysql.php
@@ -707,7 +707,7 @@ class fulltext_mysql extends search_backend
 	*/
 	function index_remove($post_ids, $author_ids, $forum_ids)
 	{
-		$this->destroy_cache(array(), $author_ids);
+		$this->destroy_cache(array(), array_unique($author_ids));
 	}
 
 	/**
@@ -896,11 +896,7 @@ class fulltext_mysql extends search_backend
 		}
 		$db->sql_freeresult($result);
 
-		$sql = 'SELECT COUNT(post_id) as total_posts
-			FROM ' . POSTS_TABLE;
-		$result = $db->sql_query($sql);
-		$this->stats['total_posts'] = (int) $db->sql_fetchfield('total_posts');
-		$db->sql_freeresult($result);
+		$this->stats['total_posts'] = empty($this->stats) ? 0 : $db->get_estimated_row_count(POSTS_TABLE);
 	}
 
 	/**
diff --git a/phpBB/includes/search/fulltext_native.php b/phpBB/includes/search/fulltext_native.php
index 727e3aaffb..dc961f3c8a 100644
--- a/phpBB/includes/search/fulltext_native.php
+++ b/phpBB/includes/search/fulltext_native.php
@@ -1334,7 +1334,7 @@ class fulltext_native extends search_backend
 			$db->sql_query($sql);
 		}
 
-		$this->destroy_cache(array_unique($word_texts), $author_ids);
+		$this->destroy_cache(array_unique($word_texts), array_unique($author_ids));
 	}
 
 	/**
@@ -1461,17 +1461,8 @@ class fulltext_native extends search_backend
 	{
 		global $db;
 
-		$sql = 'SELECT COUNT(*) as total_words
-			FROM ' . SEARCH_WORDLIST_TABLE;
-		$result = $db->sql_query($sql);
-		$this->stats['total_words'] = (int) $db->sql_fetchfield('total_words');
-		$db->sql_freeresult($result);
-
-		$sql = 'SELECT COUNT(*) as total_matches
-			FROM ' . SEARCH_WORDMATCH_TABLE;
-		$result = $db->sql_query($sql);
-		$this->stats['total_matches'] = (int) $db->sql_fetchfield('total_matches');
-		$db->sql_freeresult($result);
+		$this->stats['total_words']		= $db->get_estimated_row_count(SEARCH_WORDLIST_TABLE);
+		$this->stats['total_matches']	= $db->get_estimated_row_count(SEARCH_WORDMATCH_TABLE);
 	}
 
 	/**
diff --git a/phpBB/includes/search/search.php b/phpBB/includes/search/search.php
index 2f20d11495..df7c8a0892 100644
--- a/phpBB/includes/search/search.php
+++ b/phpBB/includes/search/search.php
@@ -295,7 +295,7 @@ class search_backend
 			$sql_where = '';
 			foreach ($authors as $author)
 			{
-				$sql_where .= (($sql_where) ? ' OR ' : '') . 'search_authors LIKE \'% ' . (int) $author . ' %\'';
+				$sql_where .= (($sql_where) ? ' OR ' : '') . 'search_authors ' . $db->sql_like_expression($db->any_char . ' ' . (int) $author . ' ' . $db->any_char);
 			}
 
 			$sql = 'SELECT search_key