Missing global variables

db_qbe.php

@@ -11,6 +11,20 @@
  */
 require_once 'libraries/common.inc.php';
 
+/**
+ * Sets globals from $_POST
+ */
+$post_params = array(
+    'Field',
+    'Show',
+    'Sort'
+);
+foreach ($post_params as $one_post_param) {
+    if (isset($_POST[$one_post_param])) {
+        $GLOBALS[$one_post_param] = $_POST[$one_post_param];
+    }
+}
+
 /**
  * Gets the relation settings
  */