3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = (array)json_decode('{"9999":true}'); var_dump(isset($arr[9999]), isset($arr['9999']));
based on 8Q4DP
Output for 7.2.0
bool(true) bool(true)
Output for 5.3.17 - 7.1.10
bool(false) bool(false)