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@ 2014-05-29T13:31:31Z

<?php

$arr = [1,2,3];

var_dump(memory_get_usage());

foreach ($arr as $k => $v) {

    var_dump(memory_get_usage());

    if (!isset($arr[$k])) {
        var_dump(memory_get_usage());
    }
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
memory_get_usage: documentation ( source)

preferences:dark modelive preview

31.41 ms | 402 KiB | 5 Q