Warning (2): Undefined array key "HTTP_REFERER" [APP/View/Galleries/viewgallery.ctp, line 121]
Code Context
               <div class="row">

             <?php echo $this->Element('paging',array('form'=>$this->params['controller']));?>

                <?php echo $this->Html->link('back',$_SERVER['HTTP_REFERER'], array('escape' => false, 'class' => 'btn btn-primary')); ?>
include - APP/View/Galleries/viewgallery.ctp, line 121
View::_evaluate() - CORE/Cake/View/View.php, line 971
View::_render() - CORE/Cake/View/View.php, line 933
View::render() - CORE/Cake/View/View.php, line 473
Controller::render() - CORE/Cake/Controller/Controller.php, line 968
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 200
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 117