mysql_query 内存泄露

// 创建连接
$mysqli = new mysqli("localhost", "username", "password", "database");

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

// 执行查询
$sql = "SELECT id, name FROM users";
$result = $mysqli->query($sql);

// 处理结果
if ($result) {
    while ($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
    }
    // 释放结果集
    $result->free();
}

// 关闭连接
$mysqli->close();

try {
    // 创建连接
    $pdo = new PDO("mysql:host=localhost;dbname=database", "username", "password");

    // 设置错误模式
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // 执行查询
    $sql = "SELECT id, name FROM users";
    $result = $pdo->query($sql);

    // 处理结果
    while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
        echo "ID: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
    }
} catch (PDOException $e) {
    echo "连接失败: " . $e->getMessage();
}

// 关闭连接
$pdo = null;