JuniorTheoryCommon

What does the program print?

PHP

<?php

$prices = [10, 20, 30];
$total = 0;
foreach ($prices as $price) {
    $price = $price * 2;
    $total += $price;
}
echo $total, ' ', $prices[0], ' ', count($prices), "\n";

120 10 3

Expecting $price = $price * 2 to change the list: foreach puts a copy of each element into $price, so the list keeps 10, 20 and 30.
Expecting count to return the last index, 2: it returns how many elements the list holds, so count([10, 20, 30]) is 3.

How would you change the loop so that it doubles the elements of $prices itself?
What does $price hold after the loop ends?

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JuniorTheoryCommon

What does the program print?

PHP

<?php

$prices = [10, 20, 30];
$total = 0;
foreach ($prices as $price) {
    $price = $price * 2;
    $total += $price;
}
echo $total, ' ', $prices[0], ' ', count($prices), "\n";

120 10 3

Expecting $price = $price * 2 to change the list: foreach puts a copy of each element into $price, so the list keeps 10, 20 and 30.
Expecting count to return the last index, 2: it returns how many elements the list holds, so count([10, 20, 30]) is 3.

How would you change the loop so that it doubles the elements of $prices itself?
What does $price hold after the loop ends?

Back to questions Open topic in roadmap →Answer it yourself — Quiz