3v4l.org

run code in 500+ PHP versions simultaneously
<?php var_dump( mb_strtolower('Σ'));
Output for 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
string(2) "σ"
Output for 5.4.45
string(2) "�"
preferences:
72.83 ms | 1133 KiB | 4 Q