User Select for Rilwis Custom Meta Boxes

users.php

<?php
$users_list = array();
$users = get_users();
if ( !empty( $users ) )
	$users_list = array_combine( wp_list_pluck( $users, 'ID' ), wp_list_pluck( $users, 'display_name' ) );

$meta_box = array(
	'title'  => 'Project Information',
	'pages'  => array( 'project' ),

	'fields' => array(
		array(
			'name'    => 'Member',
			'id'      => 'member',
			'type'    => 'select',
			'options' => $users_list,
		),
	),
);