<?php

$servername = "localhost";

$username = "root";

$password = "admin";

$dbname = "myDB";

// 创建连接

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection

if ($conn->connect_error) {

    die("连接失败: " . $conn->connect_error);

}

$sql = "SELECT id, firstname, lastname FROM MyGuests";

$result = $conn->query($sql);

if ($result->num_rows > 0) {

    // 输出数据

    while($row = $result->fetch_assoc()) {

        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";

    }

} else {

    echo "0 结果";

}

$conn->close();

?>

<?php

$servername = "localhost";

$username = "username";

$password = "password";

$dbname = "myDB";

// 创建连接

$conn = mysqli_connect($servername, $username, $password, $dbname);

// Check connection

if (!$conn) {

    die("连接失败: " . mysqli_connect_error());

}

$sql = "SELECT id, firstname, lastname FROM MyGuests";

$result = mysqli_query($conn, $sql);

if (mysqli_num_rows($result) > 0) {

    // 输出数据

    while($row = mysqli_fetch_assoc($result)) {

        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";

    }

} else {

    echo "0 结果";

}

mysqli_close($conn);

?>

<?php

echo "<table style='border: solid 1px black;'>";

echo "<tr><th>Id</th><th>Firstname</th><th>Lastname</th></tr>";

class TableRows extends RecursiveIteratorIterator {

    function __construct($it) {

        parent::__construct($it, self::LEAVES_ONLY);

    }

    function current() {

        return "<td style='width:150px;border:1px solid black;'>" . parent::current(). "</td>";

    }

    function beginChildren() {

        echo "<tr>";

    } 

    function endChildren() {

        echo "</tr>" . "\n";

    }

} 

$servername = "localhost";

$username = "username";

$password = "password";

$dbname = "myDBPDO";

try {

    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $stmt = $conn->prepare("SELECT id, firstname, lastname FROM MyGuests");

    $stmt->execute();

    // 设置结果集为关联数组

    $result = $stmt->setFetchMode(PDO::FETCH_ASSOC);

    foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) {

        echo $v;

    }

}

catch(PDOException $e) {

    echo "Error: " . $e->getMessage();

}

$conn = null;

echo "</table>";

?>