3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(mb_strtolower('İ'));
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
string(3) "i̇"
Output for 7.2.0 - 7.2.34
string(1) "i"
preferences:
160.18 ms | 407 KiB | 5 Q