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@ 2014-07-24T22:02:52Z

<?php

$x = array('12' => 34);

var_dump($x);
var_dump(gettype(key($x)));
var_dump(array_key_exists(true, $x));
var_dump(array_key_exists(12, $x));
var_dump(array_key_exists('12', $x));
var_dump(array_key_exists(12.0, $x));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
key: documentation ( source)

preferences:dark modelive preview

34.45 ms | 402 KiB | 5 Q