mysqli 连接数据库

<?php
// 数据库连接参数
$host = 'localhost';
$user = 'your_username';
$password = 'your_password';
$database = 'your_database';

// 创建连接
$conn = new mysqli($host, $user, $password, $database);

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

// 执行查询
$sql = "SELECT id, name 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"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 关闭连接
$conn->close();
?>

$stmt = $conn->prepare("SELECT * FROM users WHERE id = ?");
$stmt->bind_param("i", $userId);
$userId = $_GET['id'];
$stmt->execute();
$result = $stmt->get_result();

$conn = new mysqli('p:' . $host, $user, $password, $database);