3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = NULL; echo 'foo ' . $foo ?? 'foo' . ' bar'; echo "\n"; echo 'correct: foo ' . ($foo ?? 'foo') . ' bar';
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
foo correct: foo foo bar
preferences:
62.57 ms | 406 KiB | 5 Q