Laravel 6.20电商网站商品页折扣百分比保留两位小数实现求助

Hey there! I see you're working on your Laravel 6.20 e-commerce site and want to display discount percentages with two decimal places instead of whole numbers. Let's get that sorted out quickly.

The Issue with Your Current Code #

Right now, you're using the round() function which truncates the result to an integer. To show two decimal places, we need to use a formatting function that preserves those decimals.

Modified Code with Two Decimal Places #

Here's how you can update your Blade template code. We'll use PHP's number_format() function, which lets us specify exactly how many decimal places to keep:

<ul class="product_marks">
    @if($row->discount_price != NULL)
        <li class="product_mark product_discount">
            -{{ number_format(($row->discount_price / $row->selling_price) * 100, 2) }}%
        </li>
    @endif
    <li class="product_mark product_new">NEW</li>
</ul>

How It Works #

• number_format() takes two key arguments here:
  • The calculated discount percentage (($row->discount_price / $row->selling_price) * 100)
  • 2 to specify we want exactly two decimal places

This will output values like -15.75% or -20.00% instead of just -16% or -20%.

Alternative: Using sprintf() #

If you prefer, you can also use sprintf() for formatting, which gives you similar control:

<li class="product_mark product_discount">
    -{{ sprintf('%.2f', ($row->discount_price / $row->selling_price) * 100) }}%
</li>

Quick Check: Discount Calculation Logic #

Just a heads up: Double-check that your variable names align with your intended calculation. For example, if discount_price is the discounted (final) price (not the discount amount), your current formula will show the percentage of the original price that the customer pays (e.g., 80% for a 20% discount). If that's not what you want, adjust the formula to:

(($row->selling_price - $row->discount_price) / $row->selling_price) * 100

This would calculate the actual percentage off the original price.

内容的提问来源于stack exchange，提问作者Masudalimran