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How to use after_setup_theme filter in WordPress

Sandeep Kumar Mishra
Sandeep Kumar Mishra
July 12, 2022
5 minutes read

after_setup_theme filter

Fires after the theme is loaded.

To use after_setup_theme filter, first you have to register it using add_filter. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at Flipper Code, always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function modify_after_setup_theme_defaults and we registered using add_filter. The first parameter after_setup_theme is name of the hook, The second parameter modify_after_setup_theme_defaults is name of the function which need to be called, third parameter is the priority of calling the hook if same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometime, you have to remove a registered hook so you can use remove_filter to remove after_setup_theme filter.


  • No parameters

Live Example

if ( ! function_exists( 'twentyfifteen_setup' ) ) :
 * Sets up theme defaults and registers support for various WordPress features.
 * Note that this function is hooked into the after_setup_theme hook, which
 * runs before the init hook. The init hook is too late for some features, such
 * as indicating support for post thumbnails.
 * @since Twenty Fifteen 1.0
'/languages' );
, 'audio', 'chat'
, array(
, twentyfifteen_fonts_url() ) );

Below is an example how you can use this hook.

                        function modify_after_setup_theme_defaults() { 
                            // Update the $arg variable according to your website requirements and return this variable. You can modify the $arg variable conditionally too if you want.

                            return $arg; 
                        // add the filter
                        add_filter( "after_setup_theme", "modify_after_setup_theme_defaults");

To remove a hook callback, use the example below.

remove_filter( "after_setup_theme", "modify_after_setup_theme_defaults");

Please make sure provide the same callback function name, priority and number of arguments while removing the hook callback.

Flipper Code is a Premium WordPress Plugins development company and integrating new functionalites into WordPress sites in form of custom WordPress Plugins since 2012. If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.

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