I have a class which loads the image sliders on some add_action. There is a function/method "render_slider" which renders the sliders on the page based on the slider selected. The theme tries to get the image slider object before the sliders are loaded.

I tried with init,plugins_loaded,to load the slider.

But still I get the error object not found

class Sliders {
  public function __construct() {
    add_filter( 'add_sliders', array( $this, 'add_sliders' ) );
  public function add_sliders($sliders) {
  public function  load_sliders() {  
     $sliders_to_load = apply_filters( 'add_sliders', array() );
     foreach ( $sliders_to_load as $slider )
        $this->sliders[ $slider->id ] = $slider;
  public function render_slider($slider_type = ''){  
          case 'rotator' : $rotator = $this->sliders[$slider_type];break; //Object Not Found
          default: break;
  • when you construct the class? i.e. when you call new Sliders?
    – gmazzap
    Apr 1, 2014 at 16:49
  • Instance is created by the action init Apr 1, 2014 at 17:07
  • 1
    That's your problem. 'plugins_loaded' is triggered before than 'init'. So when you create an the Slider instance and add hook to 'plugins_loaded' it does nothing: you can't add a function to an hook that have been already fired... use 'plugins_loaded' to create the instance, and inside __construct use add_filter('after_setup_theme',array($this,'load_sliders'),10);
    – gmazzap
    Apr 1, 2014 at 17:28
  • I created instanse on action plugins_loaded and then I load the sliders on action after_theme_setup. Till here it works fine. It loads the slider. Then again I get the object not found. I checked the code it loads the slider only once. Dont know where I am missing? Apr 2, 2014 at 7:58
  • You should load the slides once, and then use all the times you need. You don't say how are you using the slider (from a shortcode? from template tag?) nor what the add_slider method actually does...
    – gmazzap
    Apr 2, 2014 at 15:33

2 Answers 2


setup_theme run on init theme, before after_setup_theme.

The follow order on frontend, was fired in my test:

  1. load_textdomain
  2. plugins_loaded
  3. auth_cookie_valid
  4. set_current_user
  5. sanitize_comment_cookies
  6. setup_theme
  7. after_setup_theme
  8. init
  • Thanks in listing the actions trigger list in sequence. I instance the slider using plugins_loaded and the load the slider using after_setup_theme. but still the object is not found. while rendering the slider. (Sliders are loaded after_setup_theme and again intialized to empty). Apr 2, 2014 at 8:02
  • If you want to be sure, than trigger the same hook with different priority, like slider via priority 10 on after_setup_theme and render slider via priority 11 on after_setup_theme.
    – bueltge
    Apr 2, 2014 at 13:06
  • when the admin_enqueue_scripts action is triggerd? Apr 3, 2014 at 9:44
  • Is after_setup_theme is triggerd in ajax call? Apr 3, 2014 at 9:55
  • Maybe, but the right hook is wp_ajax_*
    – bueltge
    Apr 4, 2014 at 9:59

Ok. I found an other way by saving the permalink path to the wp_options. And checking whether the current page's url path is in the options list.

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