php - 在 PHP 中强制下载文件 - 在 Joomla 框架内

Question

我有一些 PHP 代码可以在数据库上运行查询，将结果保存到 csv 文件，然后允许用户下载该文件。问题是，csv 文件包含围绕实际 csv 内容的页面 HTML。

我已经在这里阅读了所有相关问题，包括 this one .不幸的是，我的代码存在于 Joomla 中，所以即使我尝试重定向到一个只包含标题的页面，Joomla 也会自动用它自己的导航代码包围它。这只发生在下载时；如果我查看保存在服务器上的 csv 文件，它不包含 HTML。

任何人都可以帮助我强制下载服务器上的实际 csv 文件，而不是浏览器正在编辑它的方式吗？我试过使用 header 位置，如下所示:

header('Location: ' . $filename);

但它会在浏览器中打开文件，而不是强制保存对话框。

这是我当前的代码:

//set dynamic filename
$filename = "customers.csv";
//open file to write csv
$fp = fopen($filename, 'w');

//get all data
$query = "select 
   c.firstname,c.lastname,c.email as customer_email, 
   a.email as address_email,c.phone as customer_phone,
   a.phone as address_phone,
   a.company,a.address1,a.address2,a.city,a.state,a.zip, c.last_signin
   from {$dbpre}customers c
   left  join  {$dbpre}customers_addresses a  on c.id = a.customer_id  order by c.last_signin desc";

$votes = mysql_query($query) or die ("File: " . __FILE__ . "<br />Line: " . __LINE__ . "<p>{$query}<p>" . mysql_error());
$counter = 1;
while ($row = mysql_fetch_array($votes,1)) {
    //put header row
    if ($counter == 1){
       $headerRow = array();
       foreach ($row as $key => $val)
          $headerRow[] = $key;
       fputcsv($fp, $headerRow);
    }
    //put data row
    fputcsv($fp, $row);
    $counter++;
}

//close file
fclose($fp);

//redirect to file
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=".$filename);
header("Content-Transfer-Encoding: binary");
readfile($filename); 
exit;

编辑完整的 URL 如下所示:

http://mysite.com/administrator/index.php?option=com_eimcart&task=customers

实际的下载链接如下所示:

http://mysite.com/administrator/index.php?option=com_eimcart&task=customers&subtask=export

更多编辑这是代码所在页面的截图；生成的文件仍在为子菜单提取 html。所选链接(导出为 CSV)的代码现在是

index.php?option=com_eimcart&task=customers&subtask=export&format=raw

现在这里是生成的、保存的文件的截图:

它在此处上传时缩小了，但以黄色突出显示的文本是子导航的 html 代码(列出客户、添加新客户、导出为 csv)。这是我的完整代码现在的样子；如果我能去掉最后一点 html 就完美了。

  $fp= fopen("php://output", 'w');

            $query = "select c.firstname,c.lastname,c.email as customer_email, 
                      a.email as address_email,c.phone as customer_phone,
                      a.phone as address_phone,  a.company, a.address1,
                      a.address2,a.city,a.state,a.zip,c.last_signin

                      from {$dbpre}customers c
                      left  join  {$dbpre}customers_addresses a on c.id = a.customer_id  
                      order by c.last_signin desc";

            $votes = mysql_query($query) or die ("File: " . __FILE__ . "<br />Line: " . __LINE__ . "<p>{$query}<p>" . mysql_error());
            $counter = 1;

            //redirect to file
            header("Content-type: application/octet-stream");
            header("Content-Disposition: attachment; filename=customers.csv");
             header("Content-Transfer-Encoding: binary");

            while ($row = mysql_fetch_array($votes,1)) {

                    //put header row
                    if ($counter == 1){
                            $headerRow = array();
                            foreach ($row as $key => $val)
                                    $headerRow[] = $key;

                            fputcsv($fp, $headerRow);
                    }

                    //put data row
                    fputcsv($fp, $row);
                $counter++;
            }

            //close file
            fclose($fp);

比约恩更新

这是对我有用的代码(我认为)。在调用操作的链接中使用 RAW 参数:

index.php?option=com_eimcart&task=customers&subtask=export&format=raw

因为这是程序性的，我们的链接在一个名为 customers.php 的文件中，如下所示:

switch ($r['subtask']){
    case 'add':
    case 'edit':
        //if the form is submitted then go to validation
                include("subnav.php");
        if ($r['custFormSubmitted'] == "true")
            include("validate.php");
        else
            include("showForm.php");
        break;

    case 'delete':
                include("subnav.php");
        include("process.php");
            break;

    case 'resetpass':
                include("subnav.php");
        include("resetpassword");
            break;

    case 'export':
        include("export_csv.php");
            break;


    default:
                include("subnav.php");
        include("list.php");
        break;
}

因此，当用户单击上面的链接时，会自动包含 export_csv.php 文件。该文件包含所有实际代码:

<?
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=customers.csv");
header("Content-Transfer-Encoding: binary");
$fp= fopen("php://output", 'w');


//get all data
$query = "select 
    c.firstname,c.lastname,c.email as customer_email, 
    a.email as address_email,c.phone as customer_phone,
    a.phone as address_phone,
    a.company,a.address1,a.address2,a.city,a.state,a.zip, c.last_signin

    from {$dbpre}customers c

    left  join  {$dbpre}customers_addresses a  on c.id = a.customer_id  order by c.last_signin desc";


$votes = mysql_query($query) or die ("File: " . __FILE__ . "<br />Line: " . __LINE__ . "<p>{$query}<p>" . mysql_error());
$counter = 1;

while ($row = mysql_fetch_array($votes,1)) {

    //put header row
    if ($counter == 1){
        $headerRow = array();
        foreach ($row as $key => $val)
            $headerRow[] = $key;

        fputcsv($fp, $headerRow);
    }

    //put data row
    fputcsv($fp, $row);
    $counter++;
}

//close file
fclose($fp);

Answer 1

这是我刚刚编写的一段示例代码，可以帮助您解决问题。在您的 Controller 中将其用作操作方法。

function get_csv() {
        $file = JPATH_ADMINISTRATOR . DS . 'test.csv';

        // Test to ensure that the file exists.
        if(!file_exists($file)) die("I'm sorry, the file doesn't seem to exist.");

        // Send file headers
        header("Content-type: text/csv");
        header("Content-Disposition: attachment;filename=test.csv");

        // Send the file contents.
        readfile($file);
    }

仅此是不够的，因为您下载的文件仍将包含周围的 html。要摆脱它并只接收 csv 文件的内容，您需要在请求中添加 format=raw 参数。在我的例子中，该方法位于 com_csvexample 组件内，因此 url 将是:

/index.php?option=com_csvexample&task=get_csv&format=raw

编辑

为了避免使用中间文件替代

//set dynamic filename
$filename = "customers.csv";
//open file to write csv
$fp = fopen($filename, 'w');

与

//open the output stream for writing
//this will allow using fputcsv later in the code
$fp= fopen("php://output", 'w');

使用此方法，您必须在将任何内容写入输出之前移动发送 header 的代码。您也不需要调用 readfile 函数。