meta_form example

?> <div id="postcustomstuff"> <div id="ajax-response"></div> <?php     $metadata = has_meta( $post->ID );
    foreach ( $metadata as $key => $value ) {
        if ( is_protected_meta( $metadata[ $key ]['meta_key'], 'post' ) || ! current_user_can( 'edit_post_meta', $post->ID, $metadata[ $key ]['meta_key'] ) ) {
            unset( $metadata[ $key ] );
        }
    }
    list_meta( $metadata );
    meta_form( $post );
    ?> </div> <p> <?php     printf(
        /* translators: %s: Documentation URL. */
        __( 'Custom fields can be used to add extra metadata to a post that you can <a href="%s">use in your theme</a>.' ),
        __( 'https://wordpress.org/documentation/article/assign-custom-fields/' )
    );
    ?> </p>