Disable Access to the WordPress Dashboard for Non-Admins

only-admin-in-dashboard.php

<?php
// Desativar acesso ao painel do WordPress para não-administradores
add_action('admin_init', 'only_admin_in_dashboard');
function only_admin_in_dashboard() {
	  if (!current_user_can('manage_options') && $_SERVER['DOING_AJAX'] != '/wp-admin/admin-ajax.php') {
		  wp_redirect(home_url()); exit;
	  }
}