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@ 2015-09-10T03:29:52Z

<?php

$arr = (array)json_decode('{"9999":true}');
var_dump(isset($arr[9999]), isset($arr['9999']));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
json_decode: documentation ( source)

preferences:dark modelive preview

54.61 ms | 402 KiB | 5 Q