PHP 데이터베이스 인터페이스를 선택하는 이유는 무엇입니까? 상세한 해석

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 查询数据
$sql = "SELECT id, name, email FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>";
    }
} else {
    echo "0 结果";
}

$conn->close();
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    
    $sql = "SELECT id, name, email FROM users";
    $stmt = $conn->prepare($sql);
    $stmt->execute();
    
    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    foreach ($result as $row) {
        echo "id: " . $row['id']. " - Name: " . $row['name']. " - Email: " . $row['email']. "<br>";
    }
} catch(PDOException $e) {
    echo "错误: " . $e->getMessage();
}
$conn = null;
?>