Question

我有这个PHP脚本来更新MySQL db的特定表：

<?php
error_reporting(E_ALL);
ini_set("display_errors", 1);
//Include connection file
require_once('../connection/connect.php');

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=reports.csv");
header("Pragma: no-cache");
header("Expires: 0");

$sql = "SELECT * FROM patient";
$stmt = $conn->prepare($sql);

$stmt->execute();
//var_dump($stmt->fetch(PDO::FETCH_ASSOC));
$data = fopen('backup.csv', 'w');
while ($row = $stmt->fetch(PDO::FETCH_ASSOC))
{
    // Export every row to a file
    fputcsv($data, $row);
}
?>

我在同一目录中创建了一个名为backup.csv的文件，每次执行此脚本时数据都会正确更新。但问题是我无法在.csv文件中的表格中添加标题。

下载的文件为空。我需要下载backup.csv而不是reports.csv。

我试过了：

header("Content-Disposition: attachment; filename="'.$data.'";");

但它没有帮助。该文件仍为空。

Answer 1

您应该在fclose($data);之后立即while loop。我建议您在执行查询代码后使用headers。请尝试/查看以下示例代码。

示例

<?php error_reporting(E_ALL); ini_set("display_errors", 1); //Include connection file require_once('../connection/connect.php'); $sql = "SELECT * FROM patient"; $stmt = $conn->prepare($sql); $stmt->execute(); //var_dump($stmt->fetch(PDO::FETCH_ASSOC)); $data = fopen('backup.csv', 'w'); while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { // Export every row to a file fputcsv($data, $row); } // Closing the file fclose($data); header("Content-type: application/octet-stream"); header("Content-Disposition: attachment; filename=backup.csv"); header("Pragma: no-cache"); header("Expires: 0"); ?>

Answer 2

您的问题是您实际上没有发送您创建的文件。

这是一个更好的结构，但请记住，您还必须将您构建的文件发送到浏览器

<?php
error_reporting(E_ALL);
ini_set("display_errors", 1);
//Include connection file
require_once('../connection/connect.php');

$sql = "SELECT * FROM patient";
$stmt = $conn->prepare($sql);

$stmt->execute();

$data = fopen('backup.csv', 'w');
while ($row = $stmt->fetch(PDO::FETCH_ASSOC))
{
    // Export every row to a file
    fputcsv($data, $row);
}
fclose($data);                 // <- close file

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=reports.csv");
header("Pragma: no-cache");
header("Expires: 0");
readfile('backup.csv');        // <- new line
?>

使用PHP导出数据后下载的文件为空

2 个答案: