the_block_editor_meta_box_post_form_hidden_fields example

    $wp_meta_boxes = apply_filters( 'filter_block_editor_meta_boxes', $wp_meta_boxes );
    $locations     = array( 'side', 'normal', 'advanced' );
    $priorities    = array( 'high', 'sorted', 'core', 'default', 'low' );

    // Render meta boxes.     ?> <form class="metabox-base-form"> <?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?> </form> <form id="toggle-custom-fields-form" method="post" action="<?php echo esc_url( admin_url( 'post.php' ) ); ?>"> <?php wp_nonce_field( 'toggle-custom-fields', 'toggle-custom-fields-nonce' ); ?> <input type="hidden" name="action" value="toggle-custom-fields" /> </form> <?php foreach ( $locations as $location ) : ?> <form class="metabox-location-<?php echo esc_attr( $location ); ?>" onsubmit="return false;"> <div id="poststuff" class="sidebar-open"> <div id="postbox-container-2" class="postbox-container"> <?php                     do_meta_boxes(