Send UTF-8 mail in PHP

How to send mail UTF-8 format using php mail

$headers  = 'From: info@test.com /r/n';
$headers .= 'Reply-To: info@test.com /r/n';
$headers .= 'Return-Path: info@test.com /r/n';
$headers .= 'X-Mailer: PHP/'.phpversion().'/r/n';
$headers .= 'Content-type: text/html; charset=UTF-8/r/n';
		
$to = info@test.com
$subject= '=?UTF-8?B?'.base64_encode($subject).'?='; /* Fixed problem */
$body = 'message';
		
$sent = mail($to,$subject,$body,$headers);