3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump([json_encode(json_decode( '{}', false )), json_encode(array())]);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(2) { [0]=> string(2) "{}" [1]=> string(2) "[]" }
preferences:
78.14 ms | 406 KiB | 5 Q