3v4l.org

run code in 500+ PHP versions simultaneously
<?php $fields= [ 'arr' => [ '3333'] ]; echo json_encode($fields, JSON_PRETTY_PRINT);
Output for 7.2.0 - 7.2.34, 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 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
{ "arr": [ "3333" ] }
preferences:
109.28 ms | 1532 KiB | 4 Q