Merge pull request #295 in ZP/z-push from bugfix/ZP-977-closing-streams-after-exporting to develop

* commit '5459f0e5':
  ZP-977 Closing streams after exporting.

src/lib/wbxml/wbxmlencoder.php

@@ -177,7 +177,7 @@ class WBXMLEncoder extends WBXMLDefs {
     }
 
     /**
-     * Puts content of a stream on the output stack.
+     * Puts content of a stream on the output stack AND closes it.
      *
      * @param resource $stream
      * @param boolean $asBase64     if true, the data will be encoded as base64, default: false
@@ -197,6 +197,8 @@ class WBXMLEncoder extends WBXMLDefs {
         if (!$asBase64) {
             stream_filter_remove($rnc_filter);
         }
+
+        fclose($stream);
     }
 
     /**