Fix old class name, missing offset

qa-include/app/post-update.php

@@ -632,7 +632,7 @@ function qa_post_unindex($postid)
  */
 function qa_question_uncache($questionId)
 {
-	$cacheDriver = Q2A_Storage_CacheFactory::getCacheDriver();
+	$cacheDriver = \Q2A\Storage\CacheFactory::getCacheDriver();
 	return $cacheDriver->delete("question:$questionId");
 }
 

qa-include/qa-base.php

@@ -25,15 +25,10 @@ define('QA_BUILD_DATE', '2019-01-12');
 
 
 /**
- * Autoloads some Q2A classes so it's possible to use them without adding a require_once first. From version 1.7 onwards.
- * These loosely follow PHP-FIG's PSR-0 standard where faux namespaces are separated by underscores. This is being done
- * slowly and carefully to maintain backwards compatibility, and does not apply to plugins, themes, nor most of the core
- * for that matter.
- *
- * Classes are stored in the qa-include/Q2A folder, and then in subfolders depending on their categorization.
- * Class names should be of the form Q2A_<Namespace>_<Class>, e.g. Q2A_Util_Debug. There may be multiple "namespaces".
- * Classes are mapped to PHP files with the underscores converted to directory separators. The Q2A_Util_Debug class is in
- * the file qa-include/Q2A/Util/Debug.php. A class named Q2A_Db_User_Messages would be in a file qa-include/Q2A/Db/User/Messages.php.
+ * Autoloads some Q2A classes so it's possible to use them without adding a require_once first. From
+ * version 1.9 onwards we follow PSR-4. Classes are stored in qa-src/ which maps to the 'Q2A' namespace.
+ * So for example \Q2A\Storage\CacheFactory maps to qa-src/Storage/CacheFactory.php.
+ * In version 1.7-1.8 we used PSR-0 so Q2A_Storage_CacheFactory would map to qa-include/Q2A/Storage/CacheFactory.php.
  *
  * @param string $class
  */

qa-src/Database/DbConnection.php

@@ -565,7 +565,7 @@ class DbConnection
 			if (is_array($param)) {
 				// If the first subparam is an array, the rest of the parameter groups should have the same
 				// amount of elements. E.G.: the output should be '(?, ?), (?, ?)' rather than '(?), (?, ?)'
-				$subArrayCount = is_array($param[0]) ? count($param[0]) : 0;
+				$subArrayCount = isset($param[0]) && is_array($param[0]) ? count($param[0]) : 0;
 
 				$paramInfo[] = array(
 					'count' => count($param),