How to modify links in PHP

PHP is a programming language widely used to develop dynamic websites. When we develop a website, we often need to modify links to achieve page jump effects. In this article, we will explore how PHP can modify links.

First, let’s understand the concept of links. The essence of a link is a line pointing to another network resource. In web development, links are often used to achieve interaction between pages. For example, users can jump to another page by clicking on a link. When we want to modify the link, we usually modify the link address or parameters to achieve different jump purposes.

1. Modify the link address

There are two situations in modifying the link address. One is to modify the link address under the current path, and the other is to modify the link address under the path of another website. link address.

1. Modify the link address under the current path

Suppose we have a link:

<a href="about.html">关于我们</a>

Its link address is relative to the current path , pointing to a file named about.html. If we want to modify it to point to another page, we only need to change the link address to the address of the other page. For example, we want to modify it to point to the product.html page:

<a href="product.html">产品介绍</a>

2. Modify the link address under the path of other websites

When we want to modify other websites When specifying a link address under a path, you need to use an absolute path. The absolute path refers to the complete path starting from the root directory, such as: http://www.example.com/about.html.

Suppose we have a link:

<a href="http://www.example.com/about.html">关于我们</a>

Its link address points to another website path. If we want to modify it to point to a new page, we only need to change the link address to the address of the new page. For example, we want to modify it to point to the contact.html page:

<a href="http://www.example.com/contact.html">联系我们</a>

2. Modify the parameters of the link

When we want to pass some data to the next page through the link, then Requires the use of linked parameters. Link parameters refer to some parameters added after the link address. These parameters are connected with question marks and equal signs in the format of key=value.

For example, if we have a link:

<a href="product.html?category=phone&id=101">苹果手机</a>

Among them, category=phone indicates that the product category is mobile phones, and id=101 indicates that the unique identifier of the product is 101. If we want to modify it to point to pages of other products, we only need to modify the id parameter:

<a href="product.html?category=phone&id=102">三星手机</a>

Through the above two methods, we have learned how to modify the link address and parameters. However, if we need to dynamically generate links in PHP code, we need to use the features of the PHP language. Below, we will demonstrate it based on actual cases.

Suppose we have a product list page and need to display all products on the page and provide links so that users can click to enter the product details page. At this time, we can use PHP code to dynamically generate the link address. The code is as follows:

<?php
// 所有商品信息
$products = [
    [
        &#39;id&#39; => '101',
        'name' => '苹果手机',
        'price' => 5999,
        'category' => 'phone'
    ],
    [
        'id' => '102',
        'name' => '华为手机',
        'price' => 4999,
        'category' => 'phone'
    ],
    [
        'id' => '103',
        'name' => '小米手机',
        'price' => 3999,
        'category' => 'phone'
    ]
];

// 遍历所有商品
foreach ($products as $product) {
    // 生成商品链接地址
    $link = "product.php?category={$product['category']}&id={$product['id']}";

    // 输出商品链接
    echo "<a href=&#39;{$link}&#39;>{$product['name']}</a>";
}
?>

In the above code, we first define a product list, including product ID, product name, product price, product classification and other information. Then, by traversing all the products, use PHP code to dynamically generate the product link address and output it to the page.

Summary:

Through this article, we learned how to modify the address and parameters of the link, and how to dynamically generate the link address through the PHP language. When we need to jump to a page when developing a website, we can rely on these techniques to modify the links to achieve interaction between pages.

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