Add background ajax query in an attempt to prevent session timeout

keepalive.php

@@ -0,0 +1,8 @@
+<?php
+
+// Keep PHP sessions alive
+// Receives requests via AJAX in the background every 10 mins to prevent PHP garbage collection ending sessions
+//  See footer.php & js/keepalive.js
+
+session_start();
+session_write_close();