3v4l.org

run code in 500+ PHP versions simultaneously
<?php $domains = [ 'danielabruña.com', 'xn--fagualpez-b7a.com', 'laconspiracióndelcastellano.com', ]; foreach ($domains as $domain) { $needs_encoding = mb_detect_encoding($domain, ['ASCII', 'UTF-8'], true) === 'UTF-8'; var_dump($domain, $needs_encoding); }
Output for 7.4.0 - 7.4.33, 8.0.1 - 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
string(17) "danielabruña.com" bool(true) string(21) "xn--fagualpez-b7a.com" bool(false) string(32) "laconspiracióndelcastellano.com" bool(true)
preferences:
93.67 ms | 1262 KiB | 4 Q