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@ 2014-08-01T13:43:03Z

<?php

$arr = ['x', 'y', 'z'];
$mask = 5;

$count = count($arr);
$mask &= pow(2, $count) - 1;
$offset = $count - 1;

$result = [];
foreach ($arr as $k => $v) {
    var_dump($offset, $k);
    if (($mask >> ($offset - $k)) & 0x1) {
        $result[] = $v;
    }
}

var_dump($result);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
pow: documentation ( source)

preferences:dark modelive preview

41.84 ms | 402 KiB | 5 Q