3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo{} echo serialize([1, '2', [3,3,3], 4.0, new Foo]);
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 - 7.1.25, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
a:5:{i:0;i:1;i:1;s:1:"2";i:2;a:3:{i:0;i:3;i:1;i:3;i:2;i:3;}i:3;d:4;i:4;O:3:"Foo":0:{}}

preferences:
103.9 ms | 2165 KiB | 4 Q