4 files changed, 21 insertions, 18 deletions

diff --git a/system/core/Lang.php b/system/core/Lang.php
index 3001f1b13..601348aa4 100644
--- a/system/core/Lang.php
+++ b/system/core/Lang.php
@@ -65,11 +65,11 @@ class CI_Lang {
 	/**
 	 * Load a language file
 	 *
-	 * @param	mixed	the name of the language file to be loaded
-	 * @param	string	the language (english, etc.)
-	 * @param	bool	return loaded array of translations
-	 * @param 	bool	add suffix to $langfile
-	 * @param 	string	alternative path to look for language file
+	 * @param	mixed	$langile		the name of the language file to be loaded
+	 * @param	string	$idiom = ''		the language (english, etc.)
+	 * @param	bool	$return = FALSE		return loaded array of translations
+	 * @param 	bool	$add_suffix = TRUE	add suffix to $langfile
+	 * @param 	string	$alt_path = ''		alternative path to look for language file
 	 * @return	mixed
 	 */
 	public function load($langfile, $idiom = '', $return = FALSE, $add_suffix = TRUE, $alt_path = '')
@@ -83,10 +83,10 @@ class CI_Lang {
 
 		$langfile .= '.php';
 
-		if ($idiom === '')
+		if (empty($idiom) OR ! ctype_alpha($idiom))
 		{
 			$config =& get_config();
-			$idiom = ( ! empty($config['language'])) ? $config['language'] : 'english';
+			$idiom = empty($config['language']) ? 'english' : $config['language'];
 		}
 
 		if ($return === FALSE && isset($this->is_loaded[$langfile]) && $this->is_loaded[$langfile] === $idiom)
diff --git a/system/core/Loader.php b/system/core/Loader.php
index 5de2e5dde..b316c8e1b 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -318,9 +318,9 @@ class CI_Loader {
 	/**
 	 * Database Loader
 	 *
-	 * @param	string	the DB credentials
-	 * @param	bool	whether to return the DB object
-	 * @param	bool	whether to enable query builder (this allows us to override the config setting)
+	 * @param	mixed	$params = ''		the DB settings
+	 * @param	bool	$return = FALSE		whether to return the DB object
+	 * @param	bool	$query_builder = NULL	whether to enable query builder (overrides the config setting)
 	 * @return	object
 	 */
 	public function database($params = '', $return = FALSE, $query_builder = NULL)
@@ -329,7 +329,7 @@ class CI_Loader {
 		$CI =& get_instance();
 
 		// Do we even need to load the database class?
-		if (class_exists('CI_DB') && $return === FALSE && $query_builder === NULL && isset($CI->db) && is_object($CI->db))
+		if ($return === FALSE && $query_builder === NULL && isset($CI->db) && is_object($CI->db) && ! empty($CI->db->conn_id))
 		{
 			return FALSE;
 		}
diff --git a/system/core/Security.php b/system/core/Security.php
index 2fbc5b34c..d7c82712d 100644
--- a/system/core/Security.php
+++ b/system/core/Security.php
@@ -161,7 +161,7 @@ class CI_Security {
 		}
 
 		// Do the tokens exist in both the _POST and _COOKIE arrays?
-		if ( ! isset($_POST[$this->_csrf_token_name]) OR ! isset($_COOKIE[$this->_csrf_cookie_name])
+		if ( ! isset($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name])
 			OR $_POST[$this->_csrf_token_name] !== $_COOKIE[$this->_csrf_cookie_name]) // Do the tokens match?
 		{
 			$this->csrf_show_error();
diff --git a/system/core/URI.php b/system/core/URI.php
index 15e6a5599..72f293c18 100644
--- a/system/core/URI.php
+++ b/system/core/URI.php
@@ -433,9 +433,9 @@ class CI_URI {
 	/**
 	 * Generate a key value pair from the URI string or Re-routed URI string
 	 *
-	 * @param	int	the starting segment number
-	 * @param	array	an array of default values
-	 * @param	string	which array we should use
+	 * @param	int	$n = 3			the starting segment number
+	 * @param	array	$default = array()	an array of default values
+	 * @param	string	$which = 'segment'	which array we should use
 	 * @return	array
 	 */
 	protected function _uri_to_assoc($n = 3, $default = array(), $which = 'segment')
@@ -445,9 +445,11 @@ class CI_URI {
 			return $default;
 		}
 
-		if (isset($this->keyval[$n]))
+		in_array($which, array('segment', 'rsegment'), TRUE) OR $which = 'segment';
+
+		if (isset($this->keyval[$which], $this->keyval[$which][$n]))
 		{
-			return $this->keyval[$n];
+			return $this->keyval[$which][$n];
 		}
 
 		if ($which === 'segment')
@@ -499,7 +501,8 @@ class CI_URI {
 		}
 
 		// Cache the array for reuse
-		$this->keyval[$n] = $retval;
+		isset($this->keyval[$which]) OR $this->keyval[$which] = array();
+		$this->keyval[$which][$n] = $retval;
 		return $retval;
 	}