고품질 PHP 애플리케이션 구축: 작성 규칙을 따르는 것의 중요성

if($name != '') {
    echo 'Hello, '.$name;
} else {
    echo 'Please enter your name.';
}

$startDate = '2022-01-01';
function calculateArea($length, $width) {
    //...
}
class UserService {
    //...
}

// 检查用户名是否存在
function checkUsernameExist($username) {
    //...
}

// 获取用户信息并发送邮件
function getUserInfoAndSendEmail($userId) {
    //...
}
// 改进后的示例
function getUserInfo($userId) {
    //...
}
function sendEmail($userId, $emailContent) {
    //...
}

// 连接数据库
$connection = new mysqli($host, $username, $password, $dbname);
// 查询用户信息
$query = "SELECT * FROM users WHERE id = ?";
$stmt = $connection->prepare($query);
$stmt->bind_param("i", $userId);
$stmt->execute();
$result = $stmt->get_result();
$row = $result->fetch_assoc();
// 关闭数据库连接
$connection->close();

function connectToDatabase() {
    return new mysqli($host, $username, $password, $dbname);
}
function getUserById($userId) {
    $connection = connectToDatabase();
    $query = "SELECT * FROM users WHERE id = ?";
    $stmt = $connection->prepare($query);
    $stmt->bind_param("i", $userId);
    $stmt->execute();
    $result = $stmt->get_result();
    $row = $result->fetch_assoc();
    // 关闭数据库连接
    $connection->close();
    return $row;
}

function getUserById($userId) {
    $connection = connectToDatabase();
    if (!$connection) {
        throw new Exception('Failed to connect to database');
    }
    // ...
}