3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo $str = 'YİY', "\n"; echo bin2hex($str), "\n"; echo $tmp = mb_convert_case($str, MB_CASE_LOWER, 'UTF-8'), "\n"; echo bin2hex($tmp), "\n"; echo $tmp = mb_convert_case($tmp, MB_CASE_UPPER, 'UTF-8'), "\n"; echo bin2hex($tmp);
preferences:
26.62 ms | 405 KiB | 5 Q