Замените каждый элемент произведением всех других элементов

<?php
$line = trim(fgets(STDIN));
$nums = explode(' ', $line);

$product = null;
$productWithoutZero = null;
$zerosCount = 0;
foreach ($nums as $i => $num) {
    if ($product === null) {
        $product = $num;
    } else {
        $product *= $num;
    }
    if ($num == 0) {
        $zerosCount++;
        continue;
    }
    if ($productWithoutZero === null) {
        $productWithoutZero = $num;
    } else {
        $productWithoutZero *= $num;
    }
}
if ($zerosCount > 1) {
    $productWithoutZero = 0;
}

foreach ($nums as $i => $num) {
    if ($num == 0) {
        echo $productWithoutZero . ' ';
        continue;
    }
    echo $product / $num . ' ';
}