<?php
mb_internal_encoding('UTF-8');
$content = 'AİĞÜÇÖŞIğüçiıııışşşçççöööğğğüüüüÜÜÜÜ';
if(!mb_check_encoding($content, 'UTF-8')
OR !($content === mb_convert_encoding(mb_convert_encoding($content, 'UTF-32', 'UTF-8' ), 'UTF-8', 'UTF-32'))) {
$content = mb_convert_encoding($content, 'UTF-8');
}
echo mb_convert_case($content, MB_CASE_LOWER, "UTF-8");
echo mb_convert_case($content, MB_CASE_UPPER, "UTF-8");
preferences:
47.78 ms | 402 KiB | 5 Q