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@ 2019-10-31T20:56:35Z

<?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);

Output
Performance
VLD
References
Branches

bin2hex: documentation ( source)
mb_convert_case: documentation ( source)

preferences:dark modelive preview

71.6 ms | 402 KiB | 5 Q