1 files changed, 29 insertions, 2 deletions
diff --git a/phpBB/phpbb/cache/driver/driver_interface.php b/phpBB/phpbb/cache/driver/driver_interface.php
index 0715a4b934..8929647411 100644
--- a/phpBB/phpbb/cache/driver/driver_interface.php
+++ b/phpBB/phpbb/cache/driver/driver_interface.php
@@ -18,46 +18,73 @@ interface driver_interface
 {
 	/**
 	* Load global cache
+	*
+	* @return mixed False if an error was encountered, otherwise the data type of the cached data
 	*/
 	public function load();
 
 	/**
 	* Unload cache object
+	*
+	* @return null
 	*/
 	public function unload();
 
 	/**
 	* Save modified objects
+	*
+	* @return null
 	*/
 	public function save();
 
 	/**
 	* Tidy cache
+	*
+	* @return null
 	*/
 	public function tidy();
 
 	/**
 	* Get saved cache object
+	*
+	* @param string $var_name 		Cache key
+	* @return mixed 				False if an error was encountered, otherwise the saved cached object
 	*/
 	public function get($var_name);
 
 	/**
 	* Put data into cache
+	*
+	* @param string $var_name 		Cache key
+	* @param mixed $var 			Cached data to store
+	* @param int $ttl 				Time-to-live of cached data
+	* @return null
 	*/
 	public function put($var_name, $var, $ttl = 0);
 
 	/**
 	* Purge cache data
+	*
+	* @return null
 	*/
 	public function purge();
 
 	/**
 	* Destroy cache data
+	*
+	* @param string $var_name 		Cache key
+	* @param string $table 			Table name
+	* @return null
 	*/
 	public function destroy($var_name, $table = '');
 
 	/**
 	* Check if a given cache entry exists
+	*
+	* @param string $var_name 		Cache key
+	*
+	* @return bool 					True if cache file exists and has not expired.
+	*								False otherwise.
 	*/
 	public function _exists($var_name);
 
@@ -79,7 +106,7 @@ interface driver_interface
 	* result to persistent storage. In other words, there is no need
 	* to call save() afterwards.
 	*
-	* @param \phpbb\db\driver\driver $db	Database connection
+	* @param \phpbb\db\driver\driver_interface $db	Database connection
 	* @param string $query			SQL query, should be used for generating storage key
 	* @param mixed $query_result	The result from \dbal::sql_query, to be passed to
 	* 								\dbal::sql_fetchrow to get all rows and store them
@@ -90,7 +117,7 @@ interface driver_interface
 	* 								representing the query should be returned. Otherwise
 	* 								the original $query_result should be returned.
 	*/
-	public function sql_save(\phpbb\db\driver\driver $db, $query, $query_result, $ttl);
+	public function sql_save(\phpbb\db\driver\driver_interface $db, $query, $query_result, $ttl);
 
 	/**
 	* Check if result for a given SQL query exists in cache.