3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo { public function __construct() { echo "Side effect!\n"; } } const C = new Foo();
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.19
Fatal error: Constant expression contains invalid operations in /in/MSWi0 on line 9
Process exited with code 255.
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.33, 8.4.1 - 8.4.26, 8.5.0 - 8.5.9
Side effect!
preferences:
26.35 ms | 1138 KiB | 10 Q