3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( mb_convert_case("TEST", MB_CASE_TITLE, "UTF-8"), mb_convert_case("ŨBER", MB_CASE_TITLE, "UTF-8") );
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(4) "Test" string(5) "Ũber"

preferences:
189.61 ms | 403 KiB | 167 Q