menu_order.php

<?php
function filter_menu_order( $order ) {
	return array(
		'index.php','separator1', 'edit.php', 'edit.php?post_type=page',
		'users.php', 'upload.php', 'edit-comments.php', 'separator2', 'themes.php',
		'plugins.php', 'tools.php', 'options-general.php', 'separator-last'
	);
}
add_filter( 'menu_order', 'filter_menu_order' );
add_filter( 'custom_menu_order', '__return_true' );