6 files changed, 9 insertions, 9 deletions
diff --git a/phpBB/includes/cache/driver/apc.php b/phpBB/includes/cache/driver/apc.php
index dc0144fac3..0516b669c8 100644
--- a/phpBB/includes/cache/driver/apc.php
+++ b/phpBB/includes/cache/driver/apc.php
@@ -26,7 +26,7 @@ class phpbb_cache_driver_apc extends phpbb_cache_driver_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/cache/driver/eaccelerator.php b/phpBB/includes/cache/driver/eaccelerator.php
index 7939f043c9..257b90c76e 100644
--- a/phpBB/includes/cache/driver/eaccelerator.php
+++ b/phpBB/includes/cache/driver/eaccelerator.php
@@ -30,7 +30,7 @@ class phpbb_cache_driver_eaccelerator extends phpbb_cache_driver_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
@@ -47,7 +47,7 @@ class phpbb_cache_driver_eaccelerator extends phpbb_cache_driver_memory
 	/**
 	 * Perform cache garbage collection
 	 *
-	 * @return void
+	 * @return null
 	 */
 	function tidy()
 	{
diff --git a/phpBB/includes/cache/driver/memcache.php b/phpBB/includes/cache/driver/memcache.php
index 9fe70f8b44..3fd16b23b0 100644
--- a/phpBB/includes/cache/driver/memcache.php
+++ b/phpBB/includes/cache/driver/memcache.php
@@ -64,7 +64,7 @@ class phpbb_cache_driver_memcache extends phpbb_cache_driver_memory
 	/**
 	* Unload the cache resources
 	*
-	* @return void
+	* @return null
 	*/
 	function unload()
 	{
@@ -76,7 +76,7 @@ class phpbb_cache_driver_memcache extends phpbb_cache_driver_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/cache/driver/redis.php b/phpBB/includes/cache/driver/redis.php
index a768885962..d256b5600e 100644
--- a/phpBB/includes/cache/driver/redis.php
+++ b/phpBB/includes/cache/driver/redis.php
@@ -74,7 +74,7 @@ class phpbb_cache_driver_redis extends phpbb_cache_driver_memory
 	/**
 	* Unload the cache resources
 	*
-	* @return void
+	* @return null
 	*/
 	function unload()
 	{
@@ -86,7 +86,7 @@ class phpbb_cache_driver_redis extends phpbb_cache_driver_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/cache/driver/wincache.php b/phpBB/includes/cache/driver/wincache.php
index fa9eb95f88..58f3b4a581 100644
--- a/phpBB/includes/cache/driver/wincache.php
+++ b/phpBB/includes/cache/driver/wincache.php
@@ -26,7 +26,7 @@ class phpbb_cache_driver_wincache extends phpbb_cache_driver_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/cache/driver/xcache.php b/phpBB/includes/cache/driver/xcache.php
index 0b768bdb3e..06c5fafd97 100644
--- a/phpBB/includes/cache/driver/xcache.php
+++ b/phpBB/includes/cache/driver/xcache.php
@@ -41,7 +41,7 @@ class phpbb_cache_driver_xcache extends phpbb_cache_driver_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{