Online PHP editor | output for JnE97

<?php $a = ['asd' => false]; $time = microtime(); foreach (range(1,100000) as $i) { isset($a['asd']); } echo microtime() - $time; echo "\n"; $time = microtime(); foreach (range(1,100000) as $i) { array_key_exists('asd', $a); } echo microtime() - $time;