编辑“︁PHP MySQL连接”︁（章节）

== 实际应用案例 ==
假设我们有一个用户注册系统，需要将用户输入的数据存储到MySQL数据库中。

=== 使用MySQLi预处理语句 ===
<syntaxhighlight lang="php">
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "users";

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

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

// 准备SQL语句
$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $email);

// 设置参数并执行
$username = "john_doe";
$email = "john@example.com";
$stmt->execute();

echo "新记录插入成功";

$stmt->close();
$conn->close();
?>
</syntaxhighlight>

=== 使用PDO预处理语句 ===
<syntaxhighlight lang="php">
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "users";

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

    // 准备SQL语句
    $stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");
    $stmt->bindParam(':username', $username);
    $stmt->bindParam(':email', $email);

    // 设置参数并执行
    $username = "john_doe";
    $email = "john@example.com";
    $stmt->execute();

    echo "新记录插入成功";
} catch(PDOException $e) {
    echo "错误: " . $e->getMessage();
}
$conn = null;
?>
</syntaxhighlight>