Function to change the order of the admin menu items in WordPress.

WordPress Reorder Admin Menu

<?php
// Rearrange the admin menu
// Reference: https://codex.wordpress.org/Plugin_API/Filter_Reference/custom_menu_order
function custom_menu_order($menu_ord) {
	if (!$menu_ord) return true;
	return array(
		'index.php', // Dashboard
		'edit.php?post_type=page', // Pages
		'edit.php?post_type=YOUR-CUSTOM-POST-TYPE', // Custom Post Type
		'edit.php', // Blog Posts
		'edit-comments.php', // Comments
		'separator1', // First separator
		'upload.php', // Media
		'link-manager.php', // Links
		'separator2', // Second separator
		'themes.php', // Appearance
		'plugins.php', // Plugins
		'users.php', // Users
		'tools.php', // Tools
		'options-general.php', // Settings
		'separator-last', // Last separator
	);
}
add_filter('custom_menu_order', 'custom_menu_order'); // Activate custom_menu_order
add_filter('menu_order', 'custom_menu_order');
?>