How to implement the product paging display function in PHP Developer City

How to implement the product paging display function in the PHP developer city
With the development of the Internet and the rise of e-commerce platforms, more and more mall websites have begun to use PHP as the development language. In a shopping mall website, product display is a very important part, and the paginated display of products is an important function to improve user experience and optimize website performance. This article will introduce how to implement the product paging display function in PHP Developer City.

1. Before you start
Before implementing the product paging display function, we need to clarify some basic concepts and steps. First, we need to determine the number of products displayed on each page, which can be adjusted according to actual needs and design. Secondly, we need to get the total quantity of the item, which can be obtained through a database query. Finally, we need to calculate the total number of pages by dividing the total number of items by the number of items displayed on each page and rounding up.

2. Implement the paging function
The following is a simple PHP code example to implement the product paging display function.

1. First, we need to get the current page number.

if(isset($_GET['page'])){
    $current_page = $_GET['page'];
} else {
    $current_page = 1;  // 默认为第一页
}

2. Then, we need to calculate the total number of pages.

$total_products = // 通过数据库查询获取商品总数量
$products_per_page = 10;  // 每页显示的商品数量
$total_pages = ceil($total_products / $products_per_page);  //计算总页数

3. Next, we need to calculate the starting index of the products displayed on each page.

$start_index = ($current_page - 1) * $products_per_page;

4. Finally, we need to query the product data from the database based on the starting index and the number of products displayed on each page, and display it.

$query = "SELECT * FROM products LIMIT $start_index, $products_per_page";
$result = // 执行查询语句，获取商品数据

// 显示商品数据
while($row = // 从$result中获取一行商品数据){
    // 显示商品信息
}

3. Implement paging navigation
In addition to paging display of products, we often also need to display paging navigation at the bottom of the page to facilitate users to switch pages. The following is a simple PHP code example for implementing paging navigation functionality.

1. First, we need to determine the number of navigation links to display.

$links_per_page = 5;  // 导航链接数量

2. Then, we need to calculate the starting page number and ending page number of the navigation link.

$first_link = max($current_page - floor($links_per_page / 2), 1);
$last_link = $first_link + $links_per_page - 1;

if($last_link > $total_pages){
    $last_link = $total_pages;
    $first_link = max($last_link - $links_per_page + 1, 1);
}

3. Next, we need to loop through the output navigation links.

for($i = $first_link; $i <= $last_link; $i++){
    if($i == $current_page){
        echo "<span class='current'>$i</span>";
    } else {
        echo "<a href='?page=$i'>$i</a>";
    }
}

With the above code, we can display a paging navigation at the bottom of the page to facilitate users to quickly jump to other pages.

Summary
When developing a city website in PHP, the paging display function of products is essential. Through reasonable calculations and queries, we can realize paging display of products and provide paging navigation at the bottom of the page to help users quickly switch pages. Through continuous optimization and improvement, the user experience and performance of the mall website can be improved.

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