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Introduction to else
Conditions in PHP13/15
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  • 1. Change the value of the variable
  • 2. The if condition in PHP
  • 3. Using arithmetic operators in PHP
  • 4. Add the price to the product page
  • 5. Embedding the condition if in the template
  • 6. Using the logical values true and false
  • 7. Using the gate OR in PHP
  • 8. String concatenation in PHP
  • 9. Embedding a variable in a template
  • 10. Check several conditions
  • 11. Using the gate AND in PHP
  • 12. Introduction to else
  • 13. Add the delivery cost to the template
  • 14. Substitute values from the database with variables
  • 15. Summary of “Conditions in PHP”
Substitute values from the database with variables
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Add the delivery cost to the template

The block with the content for the delivery information page has already been prepared, and it is located in the components/delivery_info.php file. The developers output the variables $title, $img_url, and $final_price to the template. All that we have left to do is to add the delivery cost there, which is the variable $delivery_cost.

Add the variable using shorthand notation. Then in the delivery.php script change the values of the $discount and $is_new variables to make sure that the information on the page actually changes.

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Files
  • delivery.php
  • components/delivery_info.php
<?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 = 10000; $discount = 5000; $is_new = true; $is_last = true; $product_class = 'item'; if ($discount > 0) { $price_with_discount = $price - $discount ; } if ($is_new) { $product_class = $product_class . ' item-new'; } if ($discount > 1400 || $is_last) { $product_class = $product_class . ' item-hot'; }; 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="<?= $product_class ?>"> <div class="container"> <h1 class="item-title"><?= $title ?></h1> <div class="item-img"> <img src="<?= $img_url ?>" width="510" height="392" alt="<?= $title ?>"> </div> <div class="item-buy"> <div class="price"> <p class="price-old"><i>Price </i>$<?= $price ?></p> <?php if ($discount > 0): ?> <p class="price-new"><i>New price </i>$<?= $price_with_discount ?></p> <?php endif; ?> </div> </div> </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'); }
<?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 = 2500; $discount = 600; $is_new = true; $final_price = $price; if ($discount > 0) { $final_price = $price - $discount; } if ($is_new && $final_price < 2000) { $delivery_cost = $final_price; } else { $delivery_cost = $final_price / 20; } require('components/delivery_info.php'); require('components/footer.php');
<section class="order"> <div class="container"> <h1 class="order-title">Delivery order</h1> <table class="order-list"> <tr> <th>Photos</th> <th>Product name</th> <th>Price</th> <th>Delivery price</th> </tr> <tr> <td><img src="<?= $img_url ?>" width="68" height="52" alt="<?= $title ?>"></td> <td><?= $title ?></td> <td>$<?= $final_price ?></td> <td><span class="price">$1000</span></td> </tr> </table> </div> </section>
  • components/
    • footer.php
    • header.php
    • product_info.php
    • delivery_info.php
  • product.php
  • style.css
  • products_db.php
  • delivery.php
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<?php
require('products_db.php');
 
 
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<section class="order">
<div class="container">
 
 
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    1. On line 15 delete 1000 and replace this number with the variable $delivery_cost. Don’t forget about the PHP tags.
    2. In the delivery.php script change the value $is_new to false and see how the delivery cost changes on the page.
    3. Restore the value true to $is_new and change the value of the variable $discount to 1000. Look at the delivery cost on the page.

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