Function and usage of create_initial_post_types() in wordpress


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    The create_initial_post_types() function in WordPress plays a crucial role in the setup and functionality of a WordPress site. Here's a detailed explanation of its function and a sample usage:




    This function is designed to create the initial set of post types in WordPress when the init action is fired. Post types are a fundamental part of WordPress and include various types of content like posts, pages, attachments, revisions, and custom post types.


    • Init Action: The init action is a hook that WordPress provides, which triggers after WordPress has finished loading but before any headers are sent. Most of WordPress is loaded at this stage, and the user is authenticated.
    • Usage: create_initial_post_types() is hooked to this action to ensure that the basic post types are registered right at the beginning of the WordPress initialization process.
    • Core Post Types: The function sets up the default post types which are essential for a WordPress site to function correctly. These include:
      • Posts (post): The regular blog posts.
      • Pages (page): For static content.
      • Attachments (attachment): Media uploads such as images, PDFs, etc.
      • Revisions (revision): Drafts and published revisions of posts and pages.
      • Navigation Menus (nav_menu_item): Items added to navigation menus.
      • Custom CSS (custom_css): For storing custom CSS of the site.
      • Changesets (customize_changeset): For storing customizer data.

    Sample Usage:

    Typically, you don't need to directly call create_initial_post_types() in your WordPress theme or plugin. It's a low-level function used by WordPress itself. However, understanding its role is crucial for advanced WordPress development, especially if you are working with custom post types or modifying the default WordPress behavior.

    If you need to register a new post type, you would typically use the register_post_type() function within your own function hooked to the init action. For example:

    function my_custom_post_type() {
        $args = array(
            'public' => true,
            'label'  => 'Books'
        register_post_type('book', $args);
    add_action('init', 'my_custom_post_type');

    In this example, a custom post type called 'book' is created, and the my_custom_post_type function is hooked to the init action, which is the same action to which create_initial_post_types() is hooked. This ensures that your custom post type is registered right after WordPress sets up its default post types.

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