Does PHP play a front-end or back-end role in website construction?

PHP plays a back-end role in website construction

As a server-side scripting language, PHP is mainly used for the generation of dynamic web content. In website construction, PHP usually plays a back-end role, responsible for processing data and logical operations, and cooperates with front-end technology to complete the functional development and implementation of the website. This article will introduce in detail the back-end role of PHP in website construction and provide specific code examples.

1. The role of PHP backend role

1. Data processing: PHP can connect to the database and perform data query, update, insert and delete operations. Through PHP, you can interact with the database to realize the management and processing of website background data.
2. Logic control: PHP can handle complex logical judgments and control processes, and perform corresponding processing according to user operations. For example, verify and process the form data submitted by the user, implement user registration and login functions, etc.
3. Generate dynamic content: PHP can generate dynamic web content and dynamically generate pages based on user requests and database content. Through PHP, you can achieve personalized display of page content and improve user experience.
4. Interaction with the front-end: PHP and front-end technology are combined to realize data transmission and interaction. Through technologies such as AJAX, asynchronous communication between the front-end page and the back-end server can be achieved to achieve real-time updates of page content.

2. Specific code examples

1. Database connection and query

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

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 查询数据
$sql = "SELECT id, name, email FROM users";
$result = $conn->query($sql);

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

$conn->close();
?>

2. User login verification

<?php
session_start();

$username = $_POST['username'];
$password = $_POST['password'];

// 验证用户名和密码
if ($username == 'admin' && $password == '123456') {
    // 验证通过，设置Session
    $_SESSION['username'] = $username;
    echo "登录成功！";
} else {
    echo "用户名或密码错误！";
}
?>

Through the above code examples, we can clearly see the back-end role that PHP plays in website construction. Through data processing, logic control, page generation and other functions, PHP realizes the background logic processing of the website and becomes a key component of the website function. Combined with front-end technology, PHP can implement richer and more complex website functions, improving user experience and website interactivity.

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