3v4l.org

run code in 300+ PHP versions simultaneously
<?php ${!${''} = 'str'}; echo ${''};
Output for 7.3.13 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.3
str

preferences:
42.24 ms | 407 KiB | 5 Q