3v4l.org

run code in 500+ 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 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
array(2) { [0]=> string(2) "{}" [1]=> string(2) "[]" }
preferences:
77.98 ms | 1152 KiB | 4 Q