Merge pull request #24 in ZP/z-push from...

Merge pull request #24 in ZP/z-push from feature/ZP-661-backendcombined-return-min-as-version to develop

* commit '37b2caa8':
  ZP-661 Return AS supported version. Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/combined/combined.php

@@ -447,5 +447,23 @@ class BackendCombined extends Backend {
             return false;
         return substr($folderid,0,$pos);
     }
+
+    /**
+     * Indicates which AS version is supported by the backend.
+     * Return the lowest version supported by the backends used.
+     *
+     * @access public
+     * @return string       AS version constant
+     */
+    public function GetSupportedASVersion() {
+        $version = ZPush::ASV_14;
+        foreach ($this->backends as $i => $b) {
+            $subversion = $this->backends[$i]->GetSupportedASVersion();
+            if ($subversion < $version) {
+                $version = $subversion;
+            }
+        }
+        return $version;
+    }
 }
 ?>
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