wp_get_post_revisions_url() WordPress Function

function wp_get_post_revisions_url( $post_id = 0 ) {
	$post = get_post( $post_id );

	if ( ! $post instanceof WP_Post ) {
		return null;
	}

	// If the post is a revision, return early.
	if ( 'revision' === $post->post_type ) {
		return get_edit_post_link( $post );
	}

	if ( ! wp_revisions_enabled( $post ) ) {
		return null;
	}

	$revisions = wp_get_post_revisions( $post->ID, array( 'posts_per_page' => 1 ) );

	if ( 0 === count( $revisions ) ) {
		return null;
	}

	$revision = reset( $revisions );
	return get_edit_post_link( $revision );
}