3v4l.org

run code in 300+ PHP versions simultaneously
<?php function test() { $var = null; echo "a $var\n"; $var = 'pizza'; echo "b $var\n"; } test();
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
a b pizza
preferences:
52.04 ms | 406 KiB | 5 Q