Programming With GIO YT - Change by Christian Haugland

<?php
// this function was added into helpers.php

function getAmountColorStyle(float $amount): string
{
    $color;

    if($amount < 0) {
        $color = 'red';
    } elseif ($amount > 0) {
        $color = 'green';
    } else {
        $color = '';
    }

    return $color;
}

// then in transactions.php file we add:

<span style="color: <?php echo getAmountColorStyle($transaction['amount']) ?>;" >
    <?= formatDollarAmount($transaction['amount']) ?>
</span>

// This way, we only need to have one span where we put out $transaction['amount']
// and it will be styled with color-based if the number is negative or positive