3v4l.org

run code in 300+ PHP versions simultaneously
<?php $atcode = '11F5796B61690196'; var_export( strtr( str_repeat(substr($atcode, -2), 2), '012345789ABCDEF', '2301675AB89EFCD' ) );
Output for 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
'B6B6'
preferences:
73.39 ms | 978 KiB | 4 Q