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@ 2015-09-10T03:23:47Z

<?php

$small_num = '9999';
$large_num = '9999999999999999999999999999999';

$arr = (array)json_decode("{\"$large_num\":\"1\",\"$small_num\":\"1\"}");

var_dump($arr);

var_dump(array(
    'isset_small_num_key' => isset($arr[$small_num]),
    'isset_large_num_key' => isset($arr[$large_num]),
));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

42.67 ms | 402 KiB | 5 Q