3v4l.org

run code in 300+ PHP versions simultaneously
<?php const ∞ = INF; for($x = -∞;$x < ∞; $x += ∞); var_dump($x);;
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
float(NAN)
preferences:
170.88 ms | 404 KiB | 231 Q