sessions in drupal7 back for multiple

function scheduledevents_add($cruisetemplateid) {
   
    $cruise=cruise_load($cruisetemplateid);
 $title = ucwords($cruise->cruise_title);
 drupal_set_title($title, $output = CHECK_PLAIN);

//   if (isset($_SERVER['HTTP_REFERER'])) {
//  echo "<a href=".$_SERVER['HTTP_REFERER'].">Back</a>";
//    }


 $_SESSION['fromtemplateview']=true;

}

function scheduledevents_add_form($form, &$form_state, $scheduledevents) {
   
    global $base_url;
    if(isset($_SESSION['fromtemplateview'])){
        $path=$GLOBALS['base_url'] .'/admin/structure/cruise/manage';
        unset($_SESSION['fromtemplateview']);
    }else{
        $path=$GLOBALS['base_url'].'/cruiseeventlist';
    }
}

$form['back']=array(
        '#type' => 'markup',
        '#markup' =>'<div> <a style="font-size:120%;" href="'.$path.'"> < Back to Events List</a> </div>',
      
    );