How to use pre_prepare_themes_for_js filter in WordPress

So, you’ve stumbled upon the pre_prepare_themes_for_js filter and are wondering how to make the most of it in your WordPress project? Don’t worry, I’ve got you covered. We’ll go through what this hook does, how to use it, and some live examples to get you started. Let’s dive in!

pre_prepare_themes_for_js filter

Passing a non-empty array will result in wp_prepare_themes_for_js() returning early with that value instead.

To use the pre_prepare_themes_for_js 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 WePlugins 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 weplugins_modify_pre_prepare_themes_for_js_defaults which takes 3 parameters and we registered using add_filter. The first parameter pre_prepare_themes_for_js is the name of the hook, the second parameter weplugins_modify_pre_prepare_themes_for_js_defaults is the name of the function which needs to be called, the third parameter is the priority of calling the hook if the same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometimes, you have to remove a registered hook so you can use remove_filter to remove pre_prepare_themes_for_js filter.

Parameters

Below are the 3 parameters required to use this hook.

• $prepared_themes : (array) An associative array of theme data. Default is an empty array.
• $themes : (WP_Theme[]|null) An array of theme objects to prepare, if any.
• $current_theme : (string) The active theme slug.

Live Examples

Example 1: Basic Usage

This example demonstrates how to use the pre_prepare_themes_for_js filter to modify the theme data.

    function weplugins_modify_pre_prepare_themes_for_js_defaults($prepared_themes, $themes, $current_theme) {
        // Update the $prepared_themes variable according to your website requirements
        return $prepared_themes;
    }
    // Add the filter
    add_filter("pre_prepare_themes_for_js", "weplugins_modify_pre_prepare_themes_for_js_defaults", 10, 3);
    

Example 2: Conditional Modification

In this example, we conditionally modify the $prepared_themes array based on certain conditions.

    function weplugins_conditional_pre_prepare_themes_for_js($prepared_themes, $themes, $current_theme) {
        if ($current_theme === 'my-theme-slug') {
            // Modify $prepared_themes only if the current theme is 'my-theme-slug'
        }
        return $prepared_themes;
    }
    // Add the filter
    add_filter("pre_prepare_themes_for_js", "weplugins_conditional_pre_prepare_themes_for_js", 10, 3);
    

Example 3: Removing the Hook

To remove a hook callback, use the example below. Make sure you provide the same callback function name, priority, and number of arguments while removing the hook callback.

    // Remove the filter
    remove_filter("pre_prepare_themes_for_js", "weplugins_modify_pre_prepare_themes_for_js_defaults", 10, 3);
    

Contact Us

If you need any customization or are having trouble using this hook, please contact us. We’d be happy to assist you.