3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo mb_detect_encoding(html_entity_decode('&nbsp;&#xFEF8;',0,'UTF-8'),['UTF-8','ISO-8859-15']);
Output for 8.1.7 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
ISO-8859-15
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.6
UTF-8

preferences:
124.31 ms | 402 KiB | 117 Q