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@ 2014-03-14T13:18:41Z

<?php

$arr1 = array();
$arr2 = array();

$arr1[-1] = 5;
$arr2['-1'] = 5;

var_dump($arr1, $arr2);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

51.83 ms | 402 KiB | 5 Q