3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = 'hELLO wORLD'; var_dump(ucfirst(strtolower($x)));
Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
string(11) "Hello world"
preferences:
38.94 ms | 406 KiB | 5 Q