3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'Chicago41Illinos9'; var_export(++$string); $string = 'a9'; var_export(++$string);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
'Chicago41Illinot0''b0'
preferences:
55.63 ms | 402 KiB | 62 Q