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@ 2014-06-13T12:32:18Z

<?php
$keys = array(0, "", "0", 0.0, false, null, array());
foreach ($keys as $key) {
	$array = array($key => "foo");
    var_dump($key);
    var_dump(key($array));
    var_dump(isset($array[$key]));
    var_dump(array_key_exists($key, $array));
    echo "\n";
}

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

54.39 ms | 402 KiB | 5 Q