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@ 2017-07-11T14:11:42Z

<?php

$time = microtime();
$a = range(1,100000);
foreach ($a as $i) {
    isset($a['asd']);
}
echo microtime() - $time;

$time = microtime();
$a = range(1,100000);
foreach ($a as $i) {
    array_key_exists('asd', $a);
}
echo microtime() - $time;

Output
Performance
VLD
References
Branches

microtime: documentation ( source)
range: documentation ( source)

preferences:dark modelive preview

49.49 ms | 402 KiB | 5 Q