3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(dechex(128)); $wrongUtf8 = mb_convert_encoding('öäü', 'UTF-8', 'ISO-8859-1'); var_dump($wrongUtf8); $validUtf8 = mb_convert_encoding($wrongUtf8, 'ISO-8859-1', 'UTF-8'); var_dump($validUtf8); var_dump(preg_match('/^./su', $validUtf8), preg_match('/[\x80-\xFF]/', $validUtf8));
based on atSmT
Output for 4.3.0 - 7.2.0
string(2) "80" string(12) "öäü" string(6) "öäü" int(1) int(1)