Change the admin theme depending on enviroments in WordPress

gistfile1.php

<?php
add_filter( 'get_user_metadata', function ( $value, $object_id, $meta_key, $single ) {
	if ( 'admin_color' !== $meta_key || ! $single ) {
		return $value;
	}
	if ( ! defined( 'WPCOM_IS_VIP_ENV' ) ) {
		return $value;
	}
	switch ( WPCOM_IS_VIP_ENV ) {
		case 'develop':
			$value = 'light';
			break;
		case 'preprod':
			$value = 'blue';
			break;
		case 'production':
			$value = 'sunrise';
			break;
	}

	return $value;
}, 999, 4 );