以下是 PHP 数据库连接示例

<?php
// 数据库配置
$host = 'localhost';
$dbname = 'test_db';
$username = 'root';
$password = '123456';

try {
    $pdo = new PDO(
        "mysql:host=$host;dbname=$dbname;charset=utf8mb4",
        $username,
        $password
    );
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // 查询数据
    $stmt = $pdo->query("SELECT * FROM users WHERE status = 1");
    $users = $stmt->fetchAll(PDO::FETCH_ASSOC);

    foreach ($users as $user) {
        echo $user['name'] . "\n";
    }
} catch (PDOException $e) {
    die('连接失败: ' . $e->getMessage());
}
?>