Merge pull request #416 in ZP/z-push from bugfix/ZP-1094-remove-the-use-of-spl-autoload to develop

* commit '06b09cbc':
  ZP-1094 Remove the use of spl_autoload for backend inclusion. Released under the Affero GNU General Public License (AGPL) version 3.

src/lib/core/zpush.php

@@ -564,7 +564,6 @@ class ZPush {
     static public function GetBackend() {
         // if the backend is not yet loaded, load backend drivers and instantiate it
         if (!isset(ZPush::$backend)) {
-            $isIbar = false;
 
             // Initialize our backend
             $ourBackend = @constant('BACKEND_PROVIDER');
@@ -582,20 +581,13 @@ class ZPush {
                     throw new FatalMisconfigurationException("No Backend provider can be found. Check your installation and/or configuration!");
             }
             elseif (!class_exists($ourBackend)) {
-                spl_autoload_register('\ZPush::IncludeBackend');
-                $isIbar = true;
-                ZLog::Write(LOGLEVEL_DEBUG, "ZPush::GetBackend(): autoload register ZPush::IncludeBackend");
+                \ZPush::IncludeBackend($ourBackend);
             }
 
             if (class_exists($ourBackend))
                 ZPush::$backend = new $ourBackend();
             else
                 throw new FatalMisconfigurationException(sprintf("Backend provider '%s' can not be loaded. Check configuration!", $ourBackend));
-
-            if ($isIbar) {
-                spl_autoload_unregister('\ZPush::IncludeBackend');
-                ZLog::Write(LOGLEVEL_DEBUG, "ZPush::GetBackend(): autoload unregister ZPush::IncludeBackend");
-            }
         }
         return ZPush::$backend;
     }