bug:2835

ability detect mobile theme earlier, before plugin load

git-svn-id: http://piwigo.org/svn/trunk@20543 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions.inc.php

@@ -1621,6 +1621,10 @@ function get_branch_from_version($version)
  */
 function get_device()
 {
+  if (session_id() == '')
+  {
+    session_start();
+  }
   $device = pwg_get_session_var('device');
 
   if (is_null($device))
@@ -1657,6 +1661,11 @@ function mobile_theme()
     return false;
   }
 
+  if (session_id() == '')
+  {
+    session_start();
+  }
+
   if (isset($_GET['mobile']))
   {
     $is_mobile_theme = get_boolean($_GET['mobile']);