',
$footnote['id'],
$footnote['content'],
$aria_label
);
++$footnote_index;
}
return sprintf(
'%2$s',
$wrapper_attributes,
$block_content
);
}
/**
* Registers the `core/footnotes` block on the server.
*
* @since 6.3.0
*/
function register_block_core_footnotes() {
register_block_type_from_metadata(
__DIR__ . '/footnotes',
array(
'render_callback' => 'render_block_core_footnotes',
)
);
}
add_action( 'init', 'register_block_core_footnotes' );
/**
* Registers the footnotes meta field required for footnotes to work.
*
* @since 6.5.0
*/
function register_block_core_footnotes_post_meta() {
$post_types = get_post_types( array( 'show_in_rest' => true ) );
foreach ( $post_types as $post_type ) {
// Only register the meta field if the post type supports the editor, custom fields, and revisions.
if (
post_type_supports( $post_type, 'editor' ) &&
post_type_supports( $post_type, 'custom-fields' ) &&
post_type_supports( $post_type, 'revisions' )
) {
register_post_meta(
$post_type,
'footnotes',
array(
'show_in_rest' => true,
'single' => true,
'type' => 'string',
'revisions_enabled' => true,
)
);
}
}
}
/*
* Most post types are registered at priority 10, so use priority 20 here in
* order to catch them.
*/
add_action( 'init', 'register_block_core_footnotes_post_meta', 20 );
/**
* Adds the footnotes field to the revisions display.
*
* @since 6.3.0
*
* @param array $fields The revision fields.
* @return array The revision fields.
*/
function wp_add_footnotes_to_revision( $fields ) {
$fields['footnotes'] = __( 'Footnotes' );
return $fields;
}
add_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' );
/**
* Gets the footnotes field from the revision for the revisions screen.
*
* @since 6.3.0
*
* @param string $revision_field The field value, but $revision->$field
* (footnotes) does not exist.
* @param string $field The field name, in this case "footnotes".
* @param object $revision The revision object to compare against.
* @return string The field value.
*/
function wp_get_footnotes_from_revision( $revision_field, $field, $revision ) {
return get_metadata( 'post', $revision->ID, $field, true );
}
add_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );