PHP:将sql数据导出到CSV

<?php
// 连接数据库
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名";

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

// 执行SQL查询
$sql = "SELECT * FROM 表名";
$result = $conn->query($sql);

// 创建CSV文件
$csvFile = fopen("data.csv", "w");

// 写入CSV头部
$columnNames = array("列名1", "列名2", "列名3");
fputcsv($csvFile, $columnNames);

// 写入数据行
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        $rowData = array($row["列名1"], $row["列名2"], $row["列名3"]);
        fputcsv($csvFile, $rowData);
    }
}

// 关闭文件句柄
fclose($csvFile);

// 关闭数据库连接
$conn->close();
?>