<?php
function _wp_post_revision_fields( $post = array(), $deprecated = false ) {
static $fields = null;
if ( ! is_array( $post ) ) {
$post = get_post( $post, ARRAY_A );
}
if ( is_null( $fields ) ) {
$fields = array(
'post_title' => __( 'Title' ),
'post_content' => __( 'Content' ),
'post_excerpt' => __( 'Excerpt' ),
);
}