Re-order WordPress admin menu

functions-admin.php

<?php
/**
 * Custom admin functions
 */

namespace Projectname;

// Move Pages above Media
function change_menu_order( $menu_order ) {
    return array(
        'index.php',
        'edit.php',
        'edit.php?post_type=page',
        'edit.php?post_type=custom-post-type',
        'upload.php',
    );
}
add_filter( 'custom_menu_order', '__return_true' );
add_filter( 'menu_order', __NAMESPACE__ .'\change_menu_order' );