3v4l.org

run code in 500+ PHP versions simultaneously
<?php $name = "My Spécial subject ❤ "; // your subject $addr = addcslashes(mb_encode_mimeheader($name, "UTF-8", "Q"), '"'); echo $addr; ?>
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
My =?UTF-8?Q?Sp=C3=A9cial=20subject=20=E2=9D=A4=20?=
preferences:
53.19 ms | 1388 KiB | 4 Q