gistfile1.php

<?php

echo '<pre>';

// Setup input array
$input = [];
for ($i = 0; $i < 100000; $i++) {
    $input[] = rand(~PHP_INT_MAX, PHP_INT_MAX);
}

$foreach_if_times = [];
$array_filter_times = [];

for ($i = 0; $i < 100; $i++) {
    $start = microtime(true);
    array_filter($input, function ($item) {
        return ($item > 0);
    });
    $array_filter_times[] = microtime(true) - $start;
}

for ($i = 0; $i < 100; $i++) {
    $start = microtime(true);
    $result = [];
    foreach ($input as $item) {
        if ($item > 0) {
            $result[] = $item;
        }
    }
    $foreach_if_times[] = microtime(true) - $start;
}

echo sprintf("Avg time: %.8f\n", $array_filter_avg = array_sum($array_filter_times) / count($array_filter_times));
echo sprintf("Avg time: %.8f\n", $foreach_if_avg = array_sum($foreach_if_times) / count($foreach_if_times));
echo sprintf("Difference: %.8f\nRatio: %.8f\n", $array_filter_avg - $foreach_if_avg, $array_filter_avg / $foreach_if_avg);