3v4l.org

run code in 500+ PHP versions simultaneously
<?php echo mb_detect_encoding('abc', ['UTF8', 'ASCII']);
Output for 8.1.30 - 8.1.34, 8.2.22 - 8.2.31, 8.3.5 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
UTF-8
preferences:
70.1 ms | 753 KiB | 4 Q