Merge branch '3.1-stable' into develop

Conflicts resolved:
	system/core/CodeIgniter.php
	system/libraries/Cache/drivers/Cache_redis.php
	system/libraries/Session/drivers/Session_redis_driver.php
	user_guide_src/source/changelog.rst
	user_guide_src/source/conf.py
	user_guide_src/source/installation/downloads.rst
	user_guide_src/source/installation/upgrading.rst

20 files changed, 160 insertions, 98 deletions

diff --git a/system/core/Controller.php b/system/core/Controller.php
index 2bb157802..e25b8472c 100644
--- a/system/core/Controller.php
+++ b/system/core/Controller.php
@@ -59,6 +59,13 @@ class CI_Controller {
 	private static $instance;
 
 	/**
+	 * CI_Loader
+	 *
+	 * @var	CI_Loader
+	 */
+	public $load;
+
+	/**
 	 * Class constructor
 	 *
 	 * @return	void
diff --git a/system/core/Security.php b/system/core/Security.php
index 27b4db69d..5edb67f4e 100644
--- a/system/core/Security.php
+++ b/system/core/Security.php
@@ -229,6 +229,7 @@ class CI_Security {
 
 		// Check CSRF token validity, but don't error on mismatch just yet - we'll want to regenerate
 		$valid = isset($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name])
+			&& is_string($_POST[$this->_csrf_token_name]) && is_string($_COOKIE[$this->_csrf_cookie_name])
 			&& hash_equals($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name]);
 
 		// We kill this since we're done and we don't want to pollute the _POST array
diff --git a/system/database/DB_result.php b/system/database/DB_result.php
index 0dbac1633..ed5252d49 100644
--- a/system/database/DB_result.php
+++ b/system/database/DB_result.php
@@ -381,7 +381,7 @@ class CI_DB_result {
 	 */
 	public function custom_row_object($n, $type)
 	{
-		isset($this->custom_result_object[$type]) OR $this->custom_result_object($type);
+		isset($this->custom_result_object[$type]) OR $this->custom_result_object[$type] = $this->custom_result_object($type);
 
 		if (count($this->custom_result_object[$type]) === 0)
 		{
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php
index 388a46c82..bdd80092c 100644
--- a/system/database/drivers/mysql/mysql_driver.php
+++ b/system/database/drivers/mysql/mysql_driver.php
@@ -382,7 +382,7 @@ class CI_DB_mysql_driver extends CI_DB {
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
-		$sql = 'SHOW TABLES FROM '.$this->escape_identifiers($this->database);
+		$sql = 'SHOW TABLES FROM '.$this->_escape_char.$this->database.$this->_escape_char;
 
 		if ($prefix_limit !== FALSE && $this->dbprefix !== '')
 		{
diff --git a/system/database/drivers/mysqli/mysqli_driver.php b/system/database/drivers/mysqli/mysqli_driver.php
index 4f0c28e78..6553a271f 100644
--- a/system/database/drivers/mysqli/mysqli_driver.php
+++ b/system/database/drivers/mysqli/mysqli_driver.php
@@ -423,7 +423,7 @@ class CI_DB_mysqli_driver extends CI_DB {
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
-		$sql = 'SHOW TABLES FROM '.$this->escape_identifiers($this->database);
+		$sql = 'SHOW TABLES FROM '.$this->_escape_char.$this->database.$this->_escape_char;
 
 		if ($prefix_limit !== FALSE && $this->dbprefix !== '')
 		{
diff --git a/system/database/drivers/pdo/pdo_result.php b/system/database/drivers/pdo/pdo_result.php
index 03c0f9f9d..b3973da46 100644
--- a/system/database/drivers/pdo/pdo_result.php
+++ b/system/database/drivers/pdo/pdo_result.php
@@ -133,7 +133,7 @@ class CI_DB_pdo_result extends CI_DB_result {
 
 				$retval[$i]			= new stdClass();
 				$retval[$i]->name		= $field['name'];
-				$retval[$i]->type		= $field['native_type'];
+				$retval[$i]->type		= isset($field['native_type']) ? $field['native_type'] : null;
 				$retval[$i]->max_length		= ($field['len'] > 0) ? $field['len'] : NULL;
 				$retval[$i]->primary_key	= (int) ( ! empty($field['flags']) && in_array('primary_key', $field['flags'], TRUE));
 			}
diff --git a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
index 26bc30e14..73b88bcfd 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
@@ -279,7 +279,7 @@ class CI_DB_pdo_mysql_driver extends CI_DB_pdo_driver {
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
-		$sql = 'SHOW TABLES';
+		$sql = 'SHOW TABLES FROM '.$this->_escape_char.$this->database.$this->_escape_char;
 
 		if ($prefix_limit === TRUE && $this->dbprefix !== '')
 		{
diff --git a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
index b05d473ee..2d0c74b2e 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
@@ -98,7 +98,7 @@ class CI_DB_pdo_pgsql_driver extends CI_DB_pdo_driver {
 
 			if ( ! empty($this->username))
 			{
-				$this->dsn .= ';username='.$this->username;
+				$this->dsn .= ';user='.$this->username;
 				empty($this->password) OR $this->dsn .= ';password='.$this->password;
 			}
 		}
diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
index 3bc3ccd6c..3c4c23d3b 100644
--- a/system/libraries/Cache/drivers/Cache_redis.php
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -69,6 +69,14 @@ class CI_Cache_redis extends CI_Driver
 	 */
 	protected $_redis;
 
+
+	/**
+	 * del()/delete() method name depending on phpRedis version
+	 *
+	 * @var	string
+	 */
+	protected static $_delete_name;
+
 	// ------------------------------------------------------------------------
 
 	/**
@@ -90,6 +98,10 @@ class CI_Cache_redis extends CI_Driver
 			return;
 		}
 
+		isset(static::$_delete_name) OR static::$_delete_name = version_compare(phpversion('phpredis'), '5', '>=')
+			? 'del'
+			: 'delete';
+
 		$CI =& get_instance();
 
 		if ($CI->config->load('redis', TRUE, TRUE))
@@ -138,7 +150,7 @@ class CI_Cache_redis extends CI_Driver
 	{
 		$data = $this->_redis->hMGet($key, array('__ci_type', '__ci_value'));
 
-		if ( ! isset($data['__ci_type'], $data['__ci_value']) OR $data['__ci_value'] === FALSE)
+		if ($value !== FALSE && $this->_redis->sIsMember('_ci_redis_serialized', $key))
 		{
 			return FALSE;
 		}
@@ -196,9 +208,9 @@ class CI_Cache_redis extends CI_Driver
 		{
 			return FALSE;
 		}
-		elseif ($ttl)
+		else
 		{
-			$this->_redis->expireAt($id, time() + $ttl);
+			$this->_redis->sRemove('_ci_redis_serialized', $id);
 		}
 
 		return TRUE;
@@ -214,7 +226,14 @@ class CI_Cache_redis extends CI_Driver
 	 */
 	public function delete($key)
 	{
-		return ($this->_redis->delete($key) === 1);
+		if ($this->_redis->{static::$_delete_name}($key) !== 1)
+		{
+			return FALSE;
+		}
+
+		$this->_redis->sRemove('_ci_redis_serialized', $key);
+
+		return TRUE;
 	}
 
 	// ------------------------------------------------------------------------
@@ -228,7 +247,7 @@ class CI_Cache_redis extends CI_Driver
 	 */
 	public function increment($id, $offset = 1)
 	{
-		return $this->_redis->hIncrBy($id, 'data', $offset);
+		return $this->_redis->incrBy($id, $offset);
 	}
 
 	// ------------------------------------------------------------------------
@@ -242,7 +261,7 @@ class CI_Cache_redis extends CI_Driver
 	 */
 	public function decrement($id, $offset = 1)
 	{
-		return $this->_redis->hIncrBy($id, 'data', -$offset);
+		return $this->_redis->decrBy($id, $offset);
 	}
 
 	// ------------------------------------------------------------------------
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index e38c44277..de59ef9f7 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -1214,6 +1214,13 @@ class CI_Form_validation {
 			$str = $matches[2];
 		}
 
+		// Apparently, FILTER_VALIDATE_URL doesn't reject digit-only names for some reason ...
+		// See https://github.com/bcit-ci/CodeIgniter/issues/5755
+		if (ctype_digit($str))
+		{
+			return FALSE;
+		}
+
 		// PHP 7 accepts IPv6 addresses within square brackets as hostnames,
 		// but it appears that the PR that came in with https://bugs.php.net/bug.php?id=68039
 		// was never merged into a PHP 5 branch ... https://3v4l.org/8PsSN
diff --git a/system/libraries/Session/Session_driver.php b/system/libraries/Session/Session_driver.php
index 14ebdb09f..dbc833739 100644
--- a/system/libraries/Session/Session_driver.php
+++ b/system/libraries/Session/Session_driver.php
@@ -184,25 +184,4 @@ abstract class CI_Session_driver implements SessionHandlerInterface {
 
 		return TRUE;
 	}
-
-	// ------------------------------------------------------------------------
-
-	/**
-	 * Fail
-	 *
-	 * Drivers other than the 'files' one don't (need to) use the
-	 * session.save_path INI setting, but that leads to confusing
-	 * error messages emitted by PHP when open() or write() fail,
-	 * as the message contains session.save_path ...
-	 * To work around the problem, the drivers will call this method
-	 * so that the INI is set just in time for the error message to
-	 * be properly generated.
-	 *
-	 * @return	mixed
-	 */
-	protected function _fail()
-	{
-		ini_set('session.save_path', config_item('sess_save_path'));
-		return $this->_failure;
-	}
 }
diff --git a/system/libraries/Session/drivers/Session_database_driver.php b/system/libraries/Session/drivers/Session_database_driver.php
index 734fe624f..89afe3455 100644
--- a/system/libraries/Session/drivers/Session_database_driver.php
+++ b/system/libraries/Session/drivers/Session_database_driver.php
@@ -130,7 +130,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 	{
 		if (empty($this->_db->conn_id) && ! $this->_db->db_connect())
 		{
-			return $this->_fail();
+			return $this->_failure;
 		}
 
 		$this->php5_validate_id();
@@ -150,48 +150,47 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 	 */
 	public function read($session_id)
 	{
-		if ($this->_get_lock($session_id) !== FALSE)
+		if ($this->_get_lock($session_id) === FALSE)
 		{
-			// Prevent previous QB calls from messing with our queries
-			$this->_db->reset_query();
-
-			// Needed by write() to detect session_regenerate_id() calls
-			$this->_session_id = $session_id;
+			return $this->_failure;
+		}
 
-			$this->_db
-				->select('data')
-				->from($this->_config['save_path'])
-				->where('id', $session_id);
+		// Prevent previous QB calls from messing with our queries
+		$this->_db->reset_query();
 
-			if ($this->_config['match_ip'])
-			{
-				$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
-			}
+		// Needed by write() to detect session_regenerate_id() calls
+		$this->_session_id = $session_id;
 
-			if ( ! ($result = $this->_db->get()) OR ($result = $result->row()) === NULL)
-			{
-				// PHP7 will reuse the same SessionHandler object after
-				// ID regeneration, so we need to explicitly set this to
-				// FALSE instead of relying on the default ...
-				$this->_row_exists = FALSE;
-				$this->_fingerprint = md5('');
-				return '';
-			}
+		$this->_db
+			->select('data')
+			->from($this->_config['save_path'])
+			->where('id', $session_id);
 
-			// PostgreSQL's variant of a BLOB datatype is Bytea, which is a
-			// PITA to work with, so we use base64-encoded data in a TEXT
-			// field instead.
-			$result = ($this->_platform === 'postgre')
-				? base64_decode(rtrim($result->data))
-				: $result->data;
+		if ($this->_config['match_ip'])
+		{
+			$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
+		}
 
-			$this->_fingerprint = md5($result);
-			$this->_row_exists = TRUE;
-			return $result;
+		if ( ! ($result = $this->_db->get()) OR ($result = $result->row()) === NULL)
+		{
+			// PHP7 will reuse the same SessionHandler object after
+			// ID regeneration, so we need to explicitly set this to
+			// FALSE instead of relying on the default ...
+			$this->_row_exists = FALSE;
+			$this->_fingerprint = md5('');
+			return '';
 		}
 
-		$this->_fingerprint = md5('');
-		return '';
+		// PostgreSQL's variant of a BLOB datatype is Bytea, which is a
+		// PITA to work with, so we use base64-encoded data in a TEXT
+		// field instead.
+		$result = ($this->_platform === 'postgre')
+			? base64_decode(rtrim($result->data))
+			: $result->data;
+
+		$this->_fingerprint = md5($result);
+		$this->_row_exists = TRUE;
+		return $result;
 	}
 
 	// ------------------------------------------------------------------------
@@ -215,7 +214,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 		{
 			if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
 			{
-				return $this->_fail();
+				return $this->_failure;
 			}
 
 			$this->_row_exists = FALSE;
@@ -223,7 +222,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 		}
 		elseif ($this->_lock === FALSE)
 		{
-			return $this->_fail();
+			return $this->_failure;
 		}
 
 		if ($this->_row_exists === FALSE)
@@ -242,7 +241,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 				return $this->_success;
 			}
 
-			return $this->_fail();
+			return $this->_failure;
 		}
 
 		$this->_db->where('id', $session_id);
@@ -265,7 +264,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 			return $this->_success;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -280,7 +279,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 	public function close()
 	{
 		return ($this->_lock && ! $this->_release_lock())
-			? $this->_fail()
+			? $this->_failure
 			: $this->_success;
 	}
 
@@ -309,7 +308,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 
 			if ( ! $this->_db->delete($this->_config['save_path']))
 			{
-				return $this->_fail();
+				return $this->_failure;
 			}
 		}
 
@@ -319,7 +318,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 			return $this->_success;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -339,7 +338,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 
 		return ($this->_db->delete($this->_config['save_path'], 'timestamp < '.(time() - $maxlifetime)))
 			? $this->_success
-			: $this->_fail();
+			: $this->_failure;
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/libraries/Session/drivers/Session_memcached_driver.php b/system/libraries/Session/drivers/Session_memcached_driver.php
index ab54f029f..854adf821 100644
--- a/system/libraries/Session/drivers/Session_memcached_driver.php
+++ b/system/libraries/Session/drivers/Session_memcached_driver.php
@@ -117,7 +117,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 		{
 			$this->_memcached = NULL;
 			log_message('error', 'Session: Invalid Memcached save path format: '.$this->_config['save_path']);
-			return $this->_fail();
+			return $this->_failure;
 		}
 
 		foreach ($matches as $match)
@@ -142,7 +142,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 		if (empty($server_list))
 		{
 			log_message('error', 'Session: Memcached server pool is empty.');
-			return $this->_fail();
+			return $this->_failure;
 		}
 
 		$this->php5_validate_id();
@@ -172,7 +172,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 			return $session_data;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -190,14 +190,14 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 	{
 		if ( ! isset($this->_memcached, $this->_lock_key))
 		{
-			return $this->_fail();
+			return $this->_failure;
 		}
 		// Was the ID regenerated?
 		elseif ($session_id !== $this->_session_id)
 		{
 			if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
 			{
-				return $this->_fail();
+				return $this->_failure;
 			}
 
 			$this->_fingerprint = md5('');
@@ -215,7 +215,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 				return $this->_success;
 			}
 
-			return $this->_fail();
+			return $this->_failure;
 		}
 		elseif (
 			$this->_memcached->touch($key, $this->_config['expiration'])
@@ -225,7 +225,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 			return $this->_success;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -244,14 +244,14 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 			$this->_release_lock();
 			if ( ! $this->_memcached->quit())
 			{
-				return $this->_fail();
+				return $this->_failure;
 			}
 
 			$this->_memcached = NULL;
 			return $this->_success;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -273,7 +273,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 			return $this->_success;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
diff --git a/system/libraries/Session/drivers/Session_redis_driver.php b/system/libraries/Session/drivers/Session_redis_driver.php
index cba8c4f1d..1bbb13db5 100644
--- a/system/libraries/Session/drivers/Session_redis_driver.php
+++ b/system/libraries/Session/drivers/Session_redis_driver.php
@@ -185,7 +185,7 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 	{
 		if (empty($this->_config['save_path']))
 		{
-			return $this->_fail();
+			return $this->_failure;
 		}
 
 		$redis = new Redis();
@@ -216,10 +216,12 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 		}
 		else
 		{
-			log_message('error', 'Session: Unable to connect to Redis with the configured settings.');
+			$this->_redis = $redis;
+			$this->php5_validate_id();
+			return $this->_success;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -249,7 +251,7 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 			return $session_data;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -267,14 +269,14 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 	{
 		if ( ! isset($this->_redis, $this->_lock_key))
 		{
-			return $this->_fail();
+			return $this->_failure;
 		}
 		// Was the ID regenerated?
 		elseif ($session_id !== $this->_session_id)
 		{
 			if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
 			{
-				return $this->_fail();
+				return $this->_failure;
 			}
 
 			$this->_key_exists = FALSE;
@@ -291,12 +293,12 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 				return $this->_success;
 			}
 
-			return $this->_fail();
+			return $this->_failure;
 		}
 
 		return ($this->_redis->{$this->_setTimeout_name}($this->_key_prefix.$session_id, $this->_config['expiration']))
 			? $this->_success
-			: $this->_fail();
+			: $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
@@ -318,7 +320,7 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 					$this->_release_lock();
 					if ($this->_redis->close() === FALSE)
 					{
-						return $this->_fail();
+						return $this->_failure;
 					}
 				}
 			}
@@ -357,7 +359,7 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 			return $this->_success;
 		}
 
-		return $this->_fail();
+		return $this->_failure;
 	}
 
 	// ------------------------------------------------------------------------
diff --git a/tests/codeigniter/libraries/Form_validation_test.php b/tests/codeigniter/libraries/Form_validation_test.php
index 04bd670ad..1bafd50c3 100644
--- a/tests/codeigniter/libraries/Form_validation_test.php
+++ b/tests/codeigniter/libraries/Form_validation_test.php
@@ -266,6 +266,9 @@ class Form_validation_test extends CI_TestCase {
 		// URI scheme case-sensitivity: https://github.com/bcit-ci/CodeIgniter/pull/4758
 		$this->assertTrue($this->form_validation->valid_url('HtTp://127.0.0.1/'));
 
+		// https://github.com/bcit-ci/CodeIgniter/issues/5755
+		$this->assertFalse($this->form_validation->valid_url('1'));
+
 		$this->assertFalse($this->form_validation->valid_url('htt://www.codeIgniter.com'));
 		$this->assertFalse($this->form_validation->valid_url(''));
 		$this->assertFalse($this->form_validation->valid_url('code igniter'));
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 7fcd72e8a..08bcec7f7 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -129,17 +129,40 @@ Release Date: Not Released
       - Added ability to generate ``data:image/png;base64`` URIs instead of writing image files to disk.
       - Updated to always create PNG images instead of JPEG.
 
-Version 3.1.11
+Version 3.1.12
 ==============
 
 Release Date: Not Released
 
 
+Version 3.1.11
+==============
+
+Release Date: Sep 19, 2019
+
+-  General Changes
+
+   -  Changed ``CI_Log`` to append ``PHP_EOL`` instead of ``\n`` at the end of log messages.
+   -  Improved performance in :doc:`Cache Library <libraries/caching>` 'redis' driver with non-scalar variables.
+   -  Altered the :doc:`Session Library <libraries/sessions>` 'files' driver to log error and trigger a session start failure instead of throwing an ``Exception`` in case of unusable ``$config['sess_save_path']``.
+   -  Updated the :doc:`Session <libraries/sessions>` and :doc:`Cache <libraries/caching>` libraries' 'redis' driver to work with phpRedis 5.
+
 Bug fixes for 3.1.11
 ====================
 
 -  Fixed a bug (#5681) - :doc:`Database Forge <database/forge>` method ``modify_column()`` produced erroneous SQL for ``DEFAULT`` attribute changes under PostgreSQL, Firebird.
 -  Fixed a bug (#5692) - :doc:`Database Forge <database/forge>` didn't handle column nullability with the 'oci8', 'pdo/oci' drivers.
+-  Fixed a bug (#5701) - :doc:`Database <database/index>` driver 'pdo/pgsql' produced incorrect DSNs when constructing from a configuration array.
+-  Fixed a bug (#5708) - :doc:`Session Library <libraries/sessions>` 'redis' driver too often failed with locking-related errors that could've been avoided.
+-  Fixed a bug (#5703) - :doc:`Session Library <libraries/sessions>` triggered an ``E_WARNING`` message about changing ``session.save_path`` during an active session when it fails to obtain a lock.
+-  Fixed a bug where :doc:`Session Library <libraries/sessions>` 'database' driver didn't trigger a failure if it can't obtain a lock.
+-  Fixed a bug (#5755) - :doc:`Form Validation Library <libraries/form_validation>` rule **valid_url** accepted digit-only domains due to a PHP bug.
+-  Fixed a bug (#5753) - :doc:`Cache Library <libraries/caching>` 'redis' driver methods ``increment()``, ``decrement()`` ignored their ``$offset`` parameter.
+-  Fixed a bug (#5779) - :doc:`Session Library <libraries/sessions>` 'redis' only attempted to validate session IDs in case the connection to Redis failed.
+-  Fixed a bug (#5774) - :doc:`Database Results <database/results>` method ``custom_result_object()`` didn't properly handle empty result sets, triggering ``E_WARNING`` messages on PHP 7.2+.
+-  Fixed a bug (#5788) - :doc:`Database Results <database/results>` method ``field_data()`` triggered an ``E_NOTICE`` error with PDO when a field type is not recognized by PHP.
+-  Fixed a bug (#5796) - :doc:`Query Builder <database/query_builder>` method ``list_tables()`` triggered an SQL syntax error under MySQL when the database schema is a numeric string.
+-  Fixed a bug where :doc:`Security Class <libraries/security>` would trigger an ``E_WARNING`` if CSRF inputs are arrays instead of strings.
 
 Version 3.1.10
 ==============
diff --git a/user_guide_src/source/installation/downloads.rst b/user_guide_src/source/installation/downloads.rst
index 428ae3ab2..de9a22a58 100644
--- a/user_guide_src/source/installation/downloads.rst
+++ b/user_guide_src/source/installation/downloads.rst
@@ -3,7 +3,8 @@ Downloading CodeIgniter
 #######################
 
 -  `CodeIgniter v3.2.0-dev (Current version) <https://codeload.github.com/bcit-ci/CodeIgniter/zip/develop>`_
--  `CodeIgniter v3.1.11-dev <https://codeload.github.com/bcit-ci/CodeIgniter/zip/3.1-stable>`_
+-  `CodeIgniter v3.1.12-dev  <https://codeload.github.com/bcit-ci/CodeIgniter/zip/3.1-stable>`_
+-  `CodeIgniter v3.1.11 <https://codeload.github.com/bcit-ci/CodeIgniter/zip/3.1.11>`_
 -  `CodeIgniter v3.1.10 <https://codeload.github.com/bcit-ci/CodeIgniter/zip/3.1.10>`_
 -  `CodeIgniter v3.1.9 <https://codeload.github.com/bcit-ci/CodeIgniter/zip/3.1.9>`_
 -  `CodeIgniter v3.1.8 <https://codeload.github.com/bcit-ci/CodeIgniter/zip/3.1.8>`_
diff --git a/user_guide_src/source/installation/upgrade_3111.rst b/user_guide_src/source/installation/upgrade_3111.rst
index 5463e40c1..5dd02efdc 100644
--- a/user_guide_src/source/installation/upgrade_3111.rst
+++ b/user_guide_src/source/installation/upgrade_3111.rst
@@ -12,3 +12,9 @@ Replace all files and directories in your *system/* directory.
 
 .. note:: If you have any custom developed files in these directories,
 	please make copies of them first.
+
+Step 2: Replace config/mimes.php
+================================
+
+This config file has received some updates. Please copy it to
+*application/config/mimes.php*.
diff --git a/user_guide_src/source/installation/upgrade_3112.rst b/user_guide_src/source/installation/upgrade_3112.rst
new file mode 100644
index 000000000..9c849d878
--- /dev/null
+++ b/user_guide_src/source/installation/upgrade_3112.rst
@@ -0,0 +1,14 @@
+###############################
+Upgrading from 3.1.11 to 3.1.12
+###############################
+
+Before performing an update you should take your site offline by
+replacing the index.php file with a static one.
+
+Step 1: Update your CodeIgniter files
+=====================================
+
+Replace all files and directories in your *system/* directory.
+
+.. note:: If you have any custom developed files in these directories,
+	please make copies of them first.
diff --git a/user_guide_src/source/installation/upgrading.rst b/user_guide_src/source/installation/upgrading.rst
index 98f49ecac..789c9b32e 100644
--- a/user_guide_src/source/installation/upgrading.rst
+++ b/user_guide_src/source/installation/upgrading.rst
@@ -9,6 +9,7 @@ upgrading from.
 	:titlesonly:
 
 	Upgrading from 3.1.10+ to 3.2.x <upgrade_320>
+	Upgrading from 3.1.11 to 3.1.12 <upgrade_3112>
 	Upgrading from 3.1.10 to 3.1.11 <upgrade_3111>
 	Upgrading from 3.1.9 to 3.1.10 <upgrade_3110>
 	Upgrading from 3.1.8 to 3.1.9 <upgrade_319>