3v4l.org

run code in 500+ PHP versions simultaneously
<?php $arr = ['0' => '1']; echo json_encode($arr, JSON_FORCE_OBJECT);
Output for 7.1.0 - 7.1.33, 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 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
{"0":"1"}
preferences:
99.59 ms | 1637 KiB | 4 Q