3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = (array)json_decode('{"9999":true}'); var_dump(isset($arr['9999']));
based on FkXuF
Output for 7.2.0 - 7.3.1
bool(true)
Output for 5.4.0 - 7.1.25
bool(false)