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@ 2013-10-14T12:01:10Z

<?php

$arr = array(
	'foo' => 'bar',
    'key' => 'value'
);

$start = time(true);
$a = isset($arr['foo']);
$b = isset($arr['bar']);
var_dump(time(true) - $start);

$start = time(true);
$a = array_key_exists('foo', $arr);
$b = array_key_exists('bar', $arr);
var_dump(time(true) - $start);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
time: documentation ( source)

preferences:dark modelive preview

39.74 ms | 402 KiB | 5 Q