brunocmoraes/.env

## .env
ADMIN_EMAILS=user1@example.com,user2@example.com

## settings.php
<?php
return ['admin_emails' => explode(', ',  env('ADMIN_EMAILS'));]

## User.php
<?php
function isAdmin() {
  $admin_emails = config('settings.admin_emails');
  if(in_array($this->email, $admin_emails)  return true;
  else return false;
}
	<?php
	return ['admin_emails' => explode(', ', env('ADMIN_EMAILS'));]
	<?php
	function isAdmin() {
	$admin_emails = config('settings.admin_emails');
	if(in_array($this->email, $admin_emails) return true;
	else return false;
	}