php数据库下载

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

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

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

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

if ($result->num_rows > 0) {
    // 输出CSV文件头
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename="users.csv"');

    // 打开文件句柄
    $file = fopen('php://output', 'w');

    // 输出标题行
    fputcsv($file, array('ID', 'Name', 'Email'));

    // 输出数据行
    while ($row = $result->fetch_assoc()) {
        fputcsv($file, $row);
    }
} else {
    echo "0 结果";
}

// 关闭连接
$conn->close();
?>