<?php $large_num = '9999'; $small_num = '9999999999999999999999999999999'; $arr = (array)json_decode("{\"$small_num\":\"1\",\"$large_num\":\"1\"}"); var_dump($arr); var_dump(array( 'isset_small_num_key' => isset($arr[$small_num]), 'isset_large_num_key' => isset($arr[$large_num]), ));
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