Send Email with utf-8 characters on the subject

<?php

$to = 'recipient@example.com';
$message = "This is the content of this test email.";
$headers = "From: sender@example.com\r\nReply-To: sender@example.com";

$subject = "This is the subject \xf0\x9f\x8f\x94";

$subject = '=?utf-8?B?' . base64_encode($subject) . '?=';

mail($to, $subject, $message, $headers);

?>

 

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