A complete tutorial on implementing paging function in PHP

Complete tutorial on implementing paging function in PHP

In website development, we often encounter situations where large amounts of data need to be displayed in paging. In order to improve user experience and reduce server burden , we can implement the paging function through PHP. This article will introduce how to use PHP to implement the paging function, including implementing paging logic, writing code examples, and displaying the paging effect.

1. Paging logic

Before implementing the paging function, you first need to understand the basic logic of paging. Paging usually includes the following parameters:

1. Current page number: Indicates the current page number.
2. Number of data items displayed on each page: Determine how many pieces of data are displayed on each page.
3. Total data volume: total data volume.

Based on the above parameters, we can calculate the following key data:

1. Total number of pages: total_pages = ceil (total data volume/data bars displayed on each page number).
2. Start data index: start = (current page number - 1) * Number of data items displayed on each page.
3. End data index: end = current page number * number of data items displayed on each page - 1.

2. Code Example

Next, we take a simple data display page as an example to demonstrate how to use PHP to implement the paging function.

1. Database connection

First, we need to connect to the database, assuming we have a table containing datausers:

<?php
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "myDB";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
?>

2. Get the total Data volume

Next, we need to obtain the total data volume and calculate the total number of pages:

<?php
$sql = "SELECT COUNT(*) as total FROM users";
$result = $conn->query($sql);
$row = $result->fetch_assoc();
$total_records = $row['total'];
$records_per_page = 10;
$total_pages = ceil($total_records / $records_per_page);
?>

3. Paging query data

According to the current page number, perform data query and display ：

<?php
$current_page = isset($_GET['page']) ? $_GET['page'] : 1;
$start = ($current_page - 1) * $records_per_page;
$sql = "SELECT * FROM users LIMIT $start, $records_per_page";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
    }
} else {
    echo "0 结果";
}
?>

4. Paging link

Finally, generate a paging link for users to switch to different pages:

<?php
for ($i = 1; $i <= $total_pages; $i++) {
    echo "<a href='?page=$i'>$i</a> ";
}
?>

3. Paging effect

Through the above With the code example, we can implement a simple paging function. Users can see the paginated display of data on the page and switch to different pages through links to browse more data.

In general, it is not complicated to use PHP to implement the paging function. You only need to follow the above logic and sample code to easily realize the paging display of website data. I hope this article can help you understand and apply the paging function.

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