<?php
$start = microtime(true);
$mem = memory_get_usage();

function t() {
    global $argv;
    $array = array();
    for ($i = 0; $i < $argv[1]; $i++) {
        $array[] = rand(0, 100);
    }

    foreach ($array as $i => $a) {
        if (0 == $a % 2) {
            unset($array[$i]);
        }
    }


    foreach ($array as $a) {
    }

}
t();

echo "Duration: " . (microtime(true) - $start) . "\n";
echo "Memory: " . ((memory_get_usage() - $mem) / 1024 / 1024)  . " MB";