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- Theory
- Theory
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Using arithmetic operators in PHP
So, now we can determine if there is a discount. Now let’s calculate the new price of the product while taking into account this discount. The result is displayed in the console.
It is easy to calculate a new price for a product. To do this, we have two variables that store the initial price and discount amount: $price and $discount.
In the condition body, subtract the discount from the product price and write the result to the new variable $price_with_discount.
Let’s get to work!
Programmers often use mathematical signs, which are called arithmetic operators. For example, the operator + adds values together, and the operator * multiplies whereas / divides. You can learn more about this in the PHP specification.
Files
<?php
require('products_db.php');
require('components/header.php');
$id = $_GET['product_id'];
$title = get_product_title($id);
$img_url = get_img_url($id);
$price = 1000;
$discount = 500;
if ($discount > 0) {
// Create a variable here
muffin_log('Discounted!');
}
require('components/product_info.php');
require('components/footer.php');
<footer class="site-footer">
<div class="container">
<p class="copyright">© Muffin, 2019</p>
<ul class="navigation-list">
<li><a href="catalog.php">Catalog</a></li>
<li><a href="delivery.html">Delivery</a></li>
<li><a href="contacts.html">Contact us</a></li>
</ul>
<ul class="social-list">
<li>
<a class="social-link-twitter" href="https://twitter.com">
<span class="visually-hidden">Twitter</span>
</a>
</li>
<li>
<a class="social-link-instagram" href="https://instagram.com">
<span class="visually-hidden">Instagram</span>
</a>
</li>
<li>
<a class="social-link-facebook" href="https://facebook.com">
<span class="visually-hidden">Facebook</span>
</a>
</li>
</ul>
</div>
</footer>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Online store for home furnishings</title>
<link href="style.css" rel="stylesheet">
</head>
<body>
<header class="site-header">
<nav class="site-navigation">
<a class="logo-link" href="index.php">
<img src="img/logo-full.svg" width="62" height="17" alt="Gloevk store logo">
</a>
<ul class="navigation-list">
<li><a href="catalog.php">Catalog</a></li>
<li><a href="delivery.html">Delivery</a></li>
<li><a href="contacts.html">Contact us</a></li>
</ul>
</nav>
</header>
<section class="item">
<div class="container">
<h1 class="item-title"><?= $title ?></h1>
<div class="item-img">
<img src="<?= $img_url ?>" width="510" height="392" alt="<?= $title ?>">
</div>
<div class="item-buy">
<div class="price">
<p class="price-old"><i>Price </i>$10000</p>
</div>
</div>
</div>
</section>
<section class="container-inner">
<div class="container">
<h1 class="page-heading">Product catalog</h1>
<ul class="items-list">
<li>
<a class="item-card" href="product.php?product_id=1">
<h3 class="item-card-heading">Mseyulida</h3>
<p class="item-card-description">floor lamp</p>
<span class="price">$288</span>
<img src="img/item-mseyulida.jpg" width="156" height="120" alt=""Mseyulida" floor lamp">
</a>
</li>
<li>
<a class="item-card" href="product.php?product_id=2">
<h3 class="item-card-heading">Rmaeribi</h3>
<p class="item-card-description">three-seat sofa</p>
<span class="price">$5870</span>
<img src="img/item-rmaeribi.jpg" width="156" height="120" alt=""Rmaeribi" three-seat sofa">
</a>
</li>
<li>
<a class="item-card" href="product.php?product_id=3">
<h3 class="item-card-heading">Bletub</h3>
<p class="item-card-description">ceiling chandelier</p>
<span class="price">$1360</span>
<img src="img/item-bletub.jpg" width="156" height="120" alt=""Bletub" ceiling chandelier">
</a>
</li>
<li>
<a class="item-card" href="product.php?product_id=4">
<h3 class="item-card-heading">Nnulm</h3>
<p class="item-card-description">desk</p>
<span class="price">$6832</span>
<img src="img/item-nnulm.jpg" width="156" height="120" alt=""Nnulm" computer desk">
</a>
</li>
<li>
<a class="item-card" href="product.php?product_id=5">
<h3 class="item-card-heading">Asusmer</h3>
<p class="item-card-description">hanging bed</p>
<span class="price">$19320</span>
<img src="img/item-asusmer.jpg" width="156" height="120" alt=""Asusmer" hanging bed">
</a>
</li>
<li>
<a class="item-card" href="product.php?product_id=6">
<h3 class="item-card-heading">Tre</h3>
<p class="item-card-description">furniture set</p>
<span class="price">$32560</span>
<img src="img/item-tre.jpg" width="156" height="120" alt=""Tre" furniture set">
</a>
</li>
</ul>
</div>
</section>
.visually-hidden:not(:focus):not(:active),
input[type="checkbox"].visually-hidden,
input[type="radio"].visually-hidden {
position: absolute;
width: 1px;
height: 1px;
margin: -1px;
border: 0;
padding: 0;
white-space: nowrap;
clip-path: inset(100%);
clip: rect(0 0 0 0);
overflow: hidden;
}
body {
min-width: 550px;
padding: 0;
margin: 0;
font-family: "Arial", "Helvetica", sans-serif;
font-size: 13px;
line-height: 18px;
}
a {
text-decoration: none;
color: inherit;
}
.container {
width: 510px;
padding: 0 20px;
margin: 0 auto;
}
.site-navigation {
display: flex;
width: 510px;
padding: 0 20px;
margin: 0 auto;
justify-content: space-between;
}
.site-header {
position: relative;
z-index: 2;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}
.logo-link:hover,
.logo-link:focus {
opacity: 0.5;
}
.logo-link:active {
opacity: 0.3;
}
.logo-link img {
margin: 10px 0;
}
.navigation-list {
display: flex;
margin: 0 -15px 0 0;
padding: 0;
list-style: none;
flex-wrap: wrap;
justify-content: flex-end;
}
.navigation-list a:hover,
.navigation-list a:focus {
opacity: 0.5;
}
.navigation-list a:active {
color: #ff8a00;
}
.navigation-list a {
display: block;
padding: 12px 15px 11px;
color: #845927;
}
.intro .container {
z-index: -1;
min-height: 150px;
margin-bottom: 20px;
padding: 15px 0 0;
box-sizing: border-box;
background-image: url("img/index-background.jpg");
background-repeat: no-repeat;
background-position: top right;
}
.intro-title {
width: 240px;
padding: 0;
margin: 0;
font-family: "Georgia", "Times", serif;
font-size: 28px;
line-height: 36px;
font-weight: 400;
}
.intro-title b,
.features-title b,
.delivery-text b {
font-weight: 400;
color: #ff8a00;
}
.intro p {
width: 210px;
margin: 8px 0 10px;
padding: 0;
line-height: 20px;
}
.quote {
display: block;
position: relative;
padding: 0 0 0 33px;
margin: 20px 0 20px;
font-family: "Georgia", "Times", serif;
font-style: italic;
}
.quote p {
padding: 0;
margin: 0;
font-size: 16px;
line-height: 24px;
quotes: none;
}
.quote::before {
position: absolute;
content: "«";
top: 0;
left: 0;
font-size: 36px;
color: #ff8a00;
}
.author {
display: block;
padding: 0;
margin: 4px 0;
}
.popular-products {
margin: 0;
background-color: #fff3e5;
}
.delivery,
.custom,
.contacts,
.catalog,
.item,
.order {
padding-top: 15px;
padding-bottom: 10px;
}
.delivery-title,
.custom-title,
.contacts-title,
.catalog-title,
.order-title {
padding: 0;
margin: 0;
font-family: "Georgia", "Times", serif;
font-size: 28px;
line-height: 36px;
font-weight: 400;
}
.custom-columns {
display: flex;
flex-grow: 0;
}
.custom-columns img {
display: flex;
flex-shrink: 0;
align-items: center;
margin: 20px 20px 20px 0;
min-height: 200px;
}
.custom-columns div {
margin: 5px 0 20px;
}
.products-list {
display: flex;
padding: 20px 0 0;
margin: 0 0 0 -20px;
flex-wrap: wrap;
flex-shrink: 0;
list-style: none;
}
.products-list li {
display: flex;
}
.product-card {
position: relative;
display: flex;
width: 132px;
margin-bottom: 20px;
margin-left: 20px;
padding: 124px 12px 12px;
flex-direction: column;
background-color: #ffffff;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
.product-card-new {
position: relative;
}
.product-card-new::after {
position: absolute;
content: "new";
width: 34px;
height: 15px;
top: 8px;
right: -2px;
font-weight: 700;
line-height: 14px;
color: #ffffff;
text-align: center;
background-color: #ff8a00;
border-radius: 4px 0 0 4px;
}
.product-card:hover,
.product-card:focus {
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.product-card:active {
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}
.product-card img {
position: absolute;
top: 0;
left: 0;
order: -1;
}
.product-card h3 {
margin: 0 0 2px 0;
padding: 0;
font-family: "Georgia", "Times", serif;
font-size: 15px;
line-height: 18px;
font-weight: 400;
}
.product-card p {
margin: 0 0 8px 0;
padding: 0;
font-family: "Georgia", "Times", serif;
font-style: italic;
font-size: 13px;
line-height: 16px;
}
.price {
margin-top: auto;
font-weight: 700;
font-size: 15px;
color: #ff8a00;
}
.price del {
margin-right: 2px;
font-weight: 400;
font-size: 13px;
color: #000000;
text-decoration: line-through;
}
.map-link {
display: block;
margin-top: -20px;
margin-bottom: 30px;
color: #845927;
}
.map-link:hover,
.map-link:focus {
opacity: 0.5;
}
.map-link:active {
color: #ff8a00;
}
.contacts img,
.item-img {
display: flex;
flex-shrink: 0;
align-items: center;
margin: 20px 0 30px;
min-height: 200px;
}
.item-title {
display: inline-block;
vertical-align: baseline;
padding-right: 50px;
margin: 0;
font-family: "Georgia", "Times", serif;
font-size: 28px;
line-height: 36px;
font-weight: 400;
}
.item-new .item-title {
position: relative;
}
.item-new .item-title::after {
position: absolute;
content: "new";
width: 38px;
height: 16px;
top: 13px;
right: 0;
font-family: "Arial", "Helvetica", sans-serif;
font-size: 15px;
font-weight: 700;
line-height: 14px;
color: #ffffff;
text-align: center;
background-color: #ff8a00;
border-radius: 4px;
}
.item-hot .item-img {
position: relative;
padding-top: 36px;
}
.item-hot .item-img::before {
position: absolute;
content: "";
width: 510px;
height: 36px;
top: 0;
left: 0;
background-color: #fff3e5;
background-image: url("img/icon-hot.svg");
background-repeat: no-repeat;
background-size: 11px 14px;
background-position: 122px 10px;
}
.item-hot .item-img::after {
position: absolute;
content: "Buy now before it's too late! The product will soon sell out!";
top: 10px;
left: 140px;
}
.item-buy {
display: flex;
flex-wrap: wrap;
justify-content: space-between;
align-items: flex-start;
margin: 20px 0 -10px;
}
.item-buy .price {
display: flex;
flex-wrap: wrap;
align-items: baseline;
position: relative;
max-width: 510px;
margin-top: -2px;
margin-bottom: 10px;
flex-shrink: 0;
}
.item-buy p {
margin: 0 25px 10px 0;
word-wrap: break-word;
color: #000000;
font-weight: 400;
}
.item-buy i {
display: block;
margin-bottom: 2px;
font-family: "Georgia", "Times", serif;
font-style: italic;
font-size: 13px;
font-weight: 400;
color: #000000;
}
.price-old i {
margin-bottom: 3px;
}
p.price-new {
font-weight: 700;
font-size: 18px;
color: #ff8a00;
}
.button {
display: flex;
flex-shrink: 0;
max-width: 462px;
padding: 8px 24px 7px;
margin-bottom: 40px;
text-align: center;
color: #ffffff;
font-weight: 700;
text-transform: uppercase;
letter-spacing: 0.5px;
background-color: #ff8a00;
border-radius: 4px;
box-shadow: 0 4px 4px rgba(255, 138, 0, 0.4);
}
.button:hover,
.button:focus {
background-color: #ff9900;
box-shadow: 0 6px 8px rgba(255, 138, 0, 0.4);
}
.button:active {
background-color: #ff8a00;
box-shadow: 0 2px 2px rgba(255, 138, 0, 0.6);
}
.order-list {
width: 100%;
margin: 10px 0 20px;
border-collapse: collapse;
text-align: left;
}
.order-list img {
width: 68px;
height: 52px;
margin-bottom: -5px;
}
.order-list tr {
border-bottom: 1px solid #e2e2e2;
}
.order-list td {
padding: 10px 20px 10px 0;
}
.order-list th:last-child {
width: 140px;
}
.order-list th {
padding: 10px 20px 10px 0;
font-family: "Georgia", "Times", serif;
font-style: italic;
font-weight: 400;
vertical-align: bottom;
}
.order-list td:last-child,
.order-list th:last-child {
padding-right: 0;
}
.contacts-info {
margin: -10px 0 20px;
}
.contacts-info p {
position: relative;
padding-left: 16px;
margin: 12px 0;
}
.contact-phone::before {
position: absolute;
content: "";
width: 10px;
height: 13px;
top: 2px;
left: 0;
background-image: url("img/icon-phone.svg");
}
.contact-address::before {
position: absolute;
content: "";
width: 9px;
height: 13px;
top: 2px;
left: 0;
background-image: url("img/icon-pin.svg");
}
.delivery-background {
display: flex;
flex-shrink: 0;
align-items: center;
margin: 20px 0 20px;
min-height: 200px;
background-image: url("img/delivery-background.jpg");
background-repeat: no-repeat;
background-position: center left;
}
.delivery-text {
width: 210px;
margin-left: auto;
padding: 16px 20px 20px;
background-color: #ffffff;
box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}
.delivery-text p {
margin: 8px;
padding: 0;
}
.features {
padding-top: 20px;
padding-bottom: 10px;
}
.features-title,
.services-title,
.products-title {
margin: 0;
padding: 0;
font-family: "Georgia", "Times", serif;
font-size: 20px;
line-height: 24px;
font-weight: 400;
}
.features-list {
display: flex;
padding: 0;
margin: 14px 0 0;
justify-content: space-between;
flex-wrap: wrap;
list-style: none;
}
.features-list li {
position: relative;
width: 142px;
margin-bottom: 10px;
}
.features-list li::before {
position: absolute;
content: "";
top: 2px;
left: 0;
}
.feature-unique {
padding-left: 22px;
}
.feature-unique::before {
width: 16px;
height: 12px;
background-image: url("img/feature-unique.svg");
}
.feature-organic {
padding-left: 25px;
}
.feature-organic::before {
width: 19px;
height: 12px;
background-image: url("img/feature-organic.svg");
}
.feature-protected {
padding-left: 16px;
}
.feature-protected::before {
width: 10px;
height: 12px;
background-image: url("img/feature-protected.svg");
}
.site-footer {
background-color: #847462;
}
.site-footer .container {
display: flex;
flex-grow: 1;
justify-content: space-between;
}
.copyright {
margin: auto 0;
flex-shrink: 0;
color: #ffffff;
}
.site-footer .navigation-list {
margin-right: 15px;
margin-left: -15px;
justify-content: left;
}
.copyright + .navigation-list {
justify-content: center;
margin-left: 15px;
}
.site-footer a {
display: block;
margin: 0;
padding: 14px 15px;
color: #ffffff;
}
.social-list {
display: flex;
width: 110px;
padding: 0;
margin: 0 -10px 2px;
justify-content: end;
flex-shrink: 0;
flex-wrap: wrap;
align-items: center;
list-style: none;
}
.social-list a {
display: block;
width: 14px;
height: 14px;
padding: 10px;
background-repeat: no-repeat;
background-position: center;
}
.social-link-twitter {
background-image: url("img/icon-twitter.svg");
}
.social-link-instagram {
background-image: url("img/icon-instagram.svg");
}
.social-link-facebook {
background-image: url("img/icon-facebook.svg");
}
.social-list a:hover,
.social-list a:focus {
opacity: 0.5;
}
.social-list a:active {
opacity: 0.3;
}
/* Additional styles for the product promotion page */
.violet-tuesday {
margin: 0;
padding: 16px 0 18px;
text-align: center;
color: #ffffff;
background-color: #4626a1;
background-image: url("img/violet-tuesday-bg.png");
background-size: 550px auto;
background-repeat: no-repeat;
background-position: center center;
}
.violet-tuesday b {
display: block;
margin-bottom: 8px;
font-size: 32px;
line-height: 32px;
}
.violet-tuesday p {
margin: 0;
font-size: 15px;
line-height: 18px;
}
.item-violet {
min-height: 240px;
color: #ffffff;
background-color: #6f55d5;
}
.item-violet .container {
position: relative;
padding-top: 20px;
}
.item-violet .container::before {
position: absolute;
content: "";
width: 58px;
height: 34px;
top: -9px;
left: 180px;
background-image: url("img/dots-short.svg");
background-repeat: no-repeat;
opacity: 0.3;
}
.item-violet .container::after {
position: absolute;
content: "";
width: 154px;
height: 42px;
top: 184px;
left: 254px;
background-image: url("img/dots-wide.svg");
background-repeat: no-repeat;
}
.item-violet .item-img {
position: absolute;
margin: 0;
padding-top: 0;
top: 15px;
right: 20px;
color: #000000;
}
.item-violet img {
width: 255px;
height: auto;
}
.item-violet .item-title {
width: 230px;
margin-bottom: 24px;
word-wrap: break-word;
font-size: 36px;
line-height: 44px;
font-weight: 700;
}
.item-violet .item-title::after,
.item-violet .item-img::before,
.item-violet .item-img::after {
content: none;
}
.item-violet.item-new .item-img::after {
position: absolute;
content: "new";
width: 34px;
height: 15px;
top: 8px;
left: auto;
right: -2px;
font-weight: 700;
line-height: 14px;
color: #ffffff;
text-align: center;
background-color: #ff8a00;
border-radius: 4px 0 0 4px;
}
.item-violet .item-buy {
margin-top: 0;
flex-direction: column;
}
.item-violet .price {
width: 230px;
margin-top: 0;
margin-bottom: 12px;
padding-bottom: 4px;
font-size: 24px;
}
.item-violet .price i {
display: none;
}
.item-violet .price-old {
font-size: 18px;
color: #ffffff;
}
.item-violet .price-new {
font-size: 24px;
}
.item-violet p {
margin: 0 10px 12px 0;
min-width: 0;
line-height: 24px;
}
.item-violet .button {
max-width: 177px;
margin-bottom: 40px;
}
.item-violet.item-hot .price {
margin-bottom: 44px;
}
.item-violet.item-hot .price::after {
position: absolute;
content: "The product will soon sell out!";
font-size: 13px;
font-weight: 400;
color: #ffffff;
top: auto;
bottom: -25px;
left: 16px;
}
.item-violet.item-hot .price::before {
position: absolute;
content: "";
width: 11px;
height: 14px;
top: auto;
bottom: -22px;
left: 0;
background-image: url("img/icon-hot.svg");
}
<?php
function get_products() {
return [
'1' => [
'title' => 'Asusmer hanging bed',
'img_url' => 'img/item-asusmer.jpg',
'price' => 10000,
'discount' => 1000,
'is_new' => true,
'is_last' => false
],
'2' => [
'title' => 'Badeta armchair',
'img_url' => 'img/item-badeta.jpg',
'price' => 3500,
'discount' => 0,
'is_new' => false,
'is_last' => false
],
'3' => [
'title' => 'Blempere stickers',
'img_url' => 'img/item-blempere.jpg',
'price' => 500,
'discount' => 0,
'is_new' => false,
'is_last' => true
],
'4' => [
'title' => 'Bletub chandelier',
'img_url' => 'img/item-bletub.jpg',
'price' => 4000,
'discount' => 0,
'is_new' => true,
'is_last' => true
],
'5' => [
'title' => 'Breirberi organizer',
'img_url' => 'img/item-breirberi.jpg',
'price' => 5000,
'discount' => 3000,
'is_new' => true,
'is_last' => true
],
'6' => [
'title' => 'Mseyulida lamp',
'img_url' => 'img/item-mseyulida.jpg',
'price' => 4000,
'discount' => 500,
'is_new' => true,
'is_last' => false
],
'7' => [
'title' => 'Rmaeribi sofa',
'img_url' => 'img/item-rmaeribi.jpg',
'price' => 15000,
'discount' => 4500,
'is_new' => true,
'is_last' => true
],
'8' => [
'title' => 'Nnulm desk',
'img_url' => 'img/item-nnulm.jpg',
'price' => 5000,
'discount' => 0,
'is_new' => true,
'is_last' => false
],
'9' => [
'title' => 'Tre furniture set',
'img_url' => 'img/item-tre.jpg',
'price' => 20000,
'discount' => 3000,
'is_new' => true,
'is_last' => true
],
'10' => [
'title' => 'Granny style chandelier',
'img_url' => 'img/item-default-old-lamp.jpg',
'price' => 7000,
'discount' => 2000,
'is_new' => false,
'is_last' => true
],
'11' => [
'title' => 'Do lamp',
'img_url' => 'img/item-do.jpg',
'price' => 3500,
'discount' => 500,
'is_new' => true,
'is_last' => false
],
'12' => [
'title' => 'Tueta panel',
'img_url' => 'img/item-tueta.jpg',
'price' => 5000,
'discount' => 20,
'is_new' => true,
'is_last' => true
],
'13' => [
'title' => 'Nmyao pillow',
'img_url' => 'img/item-nmyao.jpg',
'price' => 1500,
'discount' => 0,
'is_new' => false,
'is_last' => false
],
'14' => [
'title' => 'Kel lamp',
'img_url' => 'img/item-kel.jpg',
'price' => 3000,
'discount' => 20,
'is_new' => true,
'is_last' => false
],
'15' => [
'title' => 'Omase pillow',
'img_url' => 'img/item-omase.jpg',
'price' => 2000,
'discount' => 100,
'is_new' => true,
'is_last' => true
],
'16' => [
'title' => 'Ormu basket',
'img_url' => 'img/item-ormu.jpg',
'price' => 2200,
'discount' => 20,
'is_new' => true,
'is_last' => false
],
'17' => [
'title' => 'Pinas paperclips',
'img_url' => 'img/item-pinas.jpg',
'price' => 100,
'discount' => 0,
'is_new' => true,
'is_last' => true
],
'18' => [
'title' => 'Preum compact cassette',
'img_url' => 'img/item-preum.jpg',
'price' => 200,
'discount' => 20,
'is_new' => true,
'is_last' => false
],
'19' => [
'title' => 'Rmob souvenir',
'img_url' => 'img/item-rmob.jpg',
'price' => 1500,
'discount' => 20,
'is_new' => false,
'is_last' => false
],
'20' => [
'title' => 'Tkuoko chandelier',
'img_url' => 'img/item-tkuoko.jpg',
'price' => 2100,
'discount' => 1000,
'is_new' => false,
'is_last' => false
],
'21' => [
'title' => 'Breirberi organizer',
'img_url' => 'img/item-breirberi.jpg',
'price' => 5000,
'discount' => 20,
'is_new' => true,
'is_last' => false
],
'22' => [
'title' => 'Briatuo armchairs',
'img_url' => 'img/item-briatuo.jpg',
'price' => 7000,
'discount' => 5500,
'is_new' => false,
'is_last' => true
]
];
}
function get_product_attribute($id, $attr) {
$products = get_products();
$result = $products[$id][$attr] ?? null;
return $result;
}
function get_product_price($id) {
return get_product_attribute($id, 'price');
}
function get_product_title($id) {
return get_product_attribute($id, 'title');
}
function get_img_url($id) {
return get_product_attribute($id, 'img_url');
}
function get_product_discount($id) {
return get_product_attribute($id, 'discount');
}
function get_product_is_new($id) {
return get_product_attribute($id, 'is_new');
}
function get_product_is_last($id) {
return get_product_attribute($id, 'is_last');
}
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Console
Console
- In the condition body, create a variable
$price_with_discount. Do not forget to write a;after the variable name. - Include the price calculation with the discount
$price - $discountin the variable. - On line 14, instead of
'Discounted!'output the variable$price_with_discountto the console and observe which number appears in the console. - Change the value of
$discountfrom500to700. Note how the number in the console changes.
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