Description: Handle mbstring.http_{in,out}put for PHP 5.6
 Having mbstring.http_input set to '' is as good as 'pass'.
 Fix mbstring warnings in ACP for PHP 5.6 compatibility. 
Author: Andreas Fischer <bantu@phpbb.com>, Oliver Schramm <oliver.schramm97@gmail.com>
Origin: upstream
Bug: https://tracker.phpbb.com/browse/PHPBB3-12468 https://tracker.phpbb.com/browse/PHPBB3-13168
Applied-Upstream: commit, https://github.com/phpbb/phpbb/commit/370015c1a5f490a7fae85da268b81cb8d1748f50 https://github.com/phpbb/phpbb/commit/53f166274aaa55b98a1c671dbb5cbd403d879157
Reviewed-by: Nils Adermann <naderman@naderman.de>
Last-Update: 2015-02-02
--- a/includes/acp/acp_main.php
+++ b/includes/acp/acp_main.php
@@ -610,8 +610,8 @@
 				'S_MBSTRING_LOADED'						=> true,
 				'S_MBSTRING_FUNC_OVERLOAD_FAIL'			=> (intval(@ini_get('mbstring.func_overload')) & (MB_OVERLOAD_MAIL | MB_OVERLOAD_STRING)),
 				'S_MBSTRING_ENCODING_TRANSLATION_FAIL'	=> (@ini_get('mbstring.encoding_translation') != 0),
-				'S_MBSTRING_HTTP_INPUT_FAIL'			=> (@ini_get('mbstring.http_input') != 'pass'),
-				'S_MBSTRING_HTTP_OUTPUT_FAIL'			=> (@ini_get('mbstring.http_output') != 'pass'),
+				'S_MBSTRING_HTTP_INPUT_FAIL'			=> !in_array(@ini_get('mbstring.http_input'), array('pass', '')),
+				'S_MBSTRING_HTTP_OUTPUT_FAIL'			=> !in_array(@ini_get('mbstring.http_output'), array('pass', '')),
 			));
 		}
 
--- a/install/install_install.php
+++ b/install/install_install.php
@@ -273,8 +273,8 @@
 			$checks = array(
 				array('func_overload', '&', MB_OVERLOAD_MAIL|MB_OVERLOAD_STRING),
 				array('encoding_translation', '!=', 0),
-				array('http_input', '!=', 'pass'),
-				array('http_output', '!=', 'pass')
+				array('http_input', '!=', array('pass', '')),
+				array('http_output', '!=', array('pass', ''))
 			);
 
 			foreach ($checks as $mb_checks)
@@ -295,7 +295,8 @@
 					break;
 
 					case '!=':
-						if ($ini_val != $mb_checks[2])
+						if (!is_array($mb_checks[2]) && $ini_val != $mb_checks[2] ||
+							is_array($mb_checks[2]) && !in_array($ini_val, $mb_checks[2]))
 						{
 							$result = '<strong style="color:red">' . $lang['NO'] . '</strong>';
 							$passed['mbstring'] = false;