3v4l.org

run code in 300+ PHP versions simultaneously
<?php json_decode(null);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.26, 7.4.0 - 7.4.14, 8.0.0