wp-admin/includes/post.php:2359Renders the meta boxes forms.
One hook fires while the_block_editor_meta_boxes() runs, in this order:
Fires right before the meta boxes are rendered.
function the_block_editor_meta_boxes() { global $post, $current_screen, $wp_meta_boxes; // Handle meta box state. $_original_meta_boxes = $wp_meta_boxes; /** * Fires right before the meta boxes are rendered. * * This allows for the filtering of meta box data, that should already be * present by this point. Do not use as a means of adding meta box data. * * @since 5.0.0 * * @param array $wp_meta_boxes Global meta box state. */ $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( $current_screen, $location, $post ); ?> </div> </div> </form> <?php endforeach; ?> <?php $meta_boxes_per_location = array(); foreach ( $locations as $location ) { $meta_boxes_per_location[ $location ] = array(); if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ] ) ) { continue; } foreach ( $priorities as $priority ) { if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ] ) ) { continue; } $meta_boxes = (array) $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ]; foreach ( $meta_boxes as $meta_box ) { if ( false === $meta_box || ! $meta_box['title'] ) { continue; } // If a meta box is just here for back compat, don't show it in the block editor. if ( isset( $meta_box['args']['__back_compat_meta_box'] ) && $meta_box['args']['__back_compat_meta_box'] ) { continue; } $meta_boxes_per_location[ $location ][] = array( 'id' => $meta_box['id'], 'title' => $meta_box['title'], ); } } } /* * Sadly we probably cannot add this data directly into editor settings.Introduced in 5.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.