How PHP functions are used in a web environment

Using PHP functions in a web environment involves tasks such as connecting to databases, processing user input, and sending emails. Specific steps include: Connect to the database using the mysqli function. Access user input using variables such as $_POST, $_GET, and $_REQUEST. Use the mail() function to send an email.

How to use PHP functions in a Web environment

Using PHP functions in a Web environment is a powerful way to perform various tasks on the server side. Task. From handling user input to connecting to databases, PHP provides a range of functions to simplify the web development process.

Connect to the database

Use PHP's mysqli function to connect to the database:

$mysqli = new mysqli("localhost", "username", "password", "database_name");

if ($mysqli->connect_error) {
    die("Connect failed: ".$mysqli->connect_error);
}

Process user input

PHP's## Built-in variables such as #$_POST, $_GET, and $_REQUEST provide ways to access user input:

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

// 验证输入并执行必要的操作

Send Email

Use PHP's

mail() function to send emails:

$to = "recipient@example.com";
$subject = "Test Email";
$message = "Hello, this is a test email.";

mail($to, $subject, $message);

Practical case: Create a user registry

The following is a practical case to show how to create a user registry in a Web environment Create a user registry using PHP functions:

<?php

// 连接到数据库
$mysqli = new mysqli("localhost", "username", "password", "database_name");

// 验证用户输入
if (isset($_POST['submit'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];

    // 验证用户名和密码输入
    if ($username && $password) {
        $hashedPassword = password_hash($password, PASSWORD_DEFAULT);

        // 使用 prepared statement 防止 SQL 注入
        $stmt = $mysqli->prepare("INSERT INTO users (username, password) VALUES (?, ?)");
        $stmt->bind_param("ss", $username, $hashedPassword);
        $stmt->execute();
        $stmt->close();

        // 显示注册成功的消息
        echo "Registration successful!";
    }
}

?>

In this example, we use the

mysqli function to connect to the database, use the $_POST variable to get user input, and use Prepared statement prevents SQL injection attacks. After all inputs have been validated, we hash the user password using the password_hash() function and store it in the database.

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