Auto add pages to primary menu with functions.php

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Is it possible to have new pages automatically added to the primary menu via functions.php?

This particular theme will be deployed on a special version of multisite, so the checkbox which is available via admin isn’t an option.

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I can’t seem to find anything in codex or on here.

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  1. Not a specific answer, but will be too long for a comment. You could also try looking at the code that WordPress core uses itself. I know you said you couldn’t use the check box that auto-adds pages, but you could look over how it is being used. A little digging around (with a decent text editor you should be able to search for a phrase throughout the entire WordPress code base) in the WordPress code reveals:

    /**
 * Automatically add newly published page objects to menus with that as an option.
 *
 * @since 3.0.0
 * @access private
 *
 * @param string $new_status The new status of the post object.
 * @param string $old_status The old status of the post object.
 * @param object $post The post object being transitioned from one status to another.
 * @return void
 */
function _wp_auto_add_pages_to_menu( $new_status, $old_status, $post ) {
    if ( 'publish' != $new_status || 'publish' == $old_status || 'page' != $post->post_type )
        return;
    if ( ! empty( $post->post_parent ) )
        return;
    $auto_add = get_option( 'nav_menu_options' );
    if ( empty( $auto_add ) || ! is_array( $auto_add ) || ! isset( $auto_add['auto_add'] ) )
        return;
    $auto_add = $auto_add['auto_add'];
    if ( empty( $auto_add ) || ! is_array( $auto_add ) )
        return;

    $args = array(
        'menu-item-object-id' => $post->ID,
        'menu-item-object' => $post->post_type,
        'menu-item-type' => 'post_type',
        'menu-item-status' => 'publish',
    );

    foreach ( $auto_add as $menu_id ) {
        $items = wp_get_nav_menu_items( $menu_id, array( 'post_status' => 'publish,draft' ) );
        if ( ! is_array( $items ) )
            continue;
        foreach ( $items as $item ) {
            if ( $post->ID == $item->object_id )
                continue 2;
        }
        wp_update_nav_menu_item( $menu_id, 0, $args );
    }
}

    This code is run on:

    add_action( 'transition_post_status',     '_wp_auto_add_pages_to_menu', 10, 3 );

    Maybe this will point you in the right direction and perhaps you can copy what WP is doing to do something similar.