MYSQL中的简单下拉列表PHP代码

<?php
// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

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

// 创建下拉列表
echo "<select>";
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "<option value='" . $row["id"] . "'>" . $row["name"] . "</option>";
    }
} else {
    echo "<option value=''>没有数据</option>";
}
echo "</select>";

// 关闭连接
$conn->close();
?>