3.2.9.9.7 a cache fix in qtranxf_filter_postmeta

qtranslate.php

@@ -3,7 +3,7 @@
 Plugin Name: qTranslate-X
 Plugin URI: http://wordpress.org/plugins/qtranslate-x/
 Description: Adds user-friendly and database-friendly multilingual content support.
-Version: 3.2.9.9.6
+Version: 3.2.9.9.7
 Author: qTranslate Team
 Author URI: http://qtranslatexteam.wordpress.com/about
 Tags: multilingual, multi, language, admin, tinymce, Polyglot, bilingual, widget, switcher, professional, human, translation, service, qTranslate, zTranslate, mqTranslate, qTranslate Plus, WPML
@@ -108,7 +108,7 @@
 	define( 'QTRANSLATE_FILE', __FILE__ );
 }
 
-define('QTX_VERSION','3.2.9.9.6');
+define('QTX_VERSION','3.2.9.9.7');
 
 require_once(dirname(__FILE__).'/qtranslate_options.php');
 require_once(dirname(__FILE__).'/qtranslate_utils.php');

qtranslate_frontend.php

@@ -606,8 +606,33 @@ function qtranxf_filter_postmeta($original_value, $object_id, $meta_key = '', $s
 		wp_cache_set( $object_id, $meta_cache, $cache_key_lang );
 	}
 
-	if(!$meta_key)
+	if(!$meta_key){
+		if($single){
+	/**
+	  @since 3.2.9.9.7
+	  The code executed after a call to this filter in /wp-includes/meta.php,
+	  in function get_metadata, is apparently designed having non-empty $meta_key in mind:
+
+	  	if ( $single && is_array( $check ) ){
+	  		return $check[0];
+	  	}else
+	  		return $check;
+
+	  Following the logic of the code "if ( !$meta_key ) return $meta_cache;",
+		a few lines below in the same function, the code above rather have to be:
+
+	  	if ( $meta_key && $single && is_array( $check ) ){
+	  		return $check[0];
+	  	}else
+	  		return $check;
+
+	  The line below offsets this imperfection.
+	  If WP ever fixes that place, this block of code will have to be removed.
+	 */
+			return array($meta_cache);
+		}
 		return $meta_cache;
+	}
 
 	if(isset($meta_cache[$meta_key]))
 		return $meta_cache[$meta_key];

readme.txt

@@ -95,6 +95,9 @@ Developers: please drop new topics here, the text will be moved to [qTranslate-X
 * Includes all changes after version 3.2.9. Please, review [Release Notes](https://qtranslatexteam.wordpress.com/2015/03/30/release-notes-3-3).
 * Translation: a lot of thanks to all translators contributed.
 
+### 3.2.9.9.7 alpha ###
+* Fix: one more problem is discovered in function `qtranxf_filter_postmeta` for the case of empty $meta_key, reported in [Issue #138](https://github.com/qTranslate-Team/qtranslate-x/issues/138).
+
 ### 3.2.9.9.6 alpha ###
 * Enhancement: override admin language from `$_POST['WPLANG']` in case user tries to change language using field 'Site Language' on page `/wp-admin/options-general.php`.
 * Fix: action 'updated_postmeta' added to clear post meta data cache: [Issue #138](https://github.com/qTranslate-Team/qtranslate-x/issues/138).