3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo; define('Foo\\null', \true); define('Foo\\true', \false); define('Foo\\false', \true); echo "null" . (null ? "1" : "0"), "\n"; echo "true" . (true ? "1" : "0"), "\n"; echo "false" . (false ? "1" : "0"), "\n";
Output for 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 - 8.3.6
null0 true1 false0
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
null1 true0 false1
preferences:
243.08 ms | 402 KiB | 287 Q