方法中的php文件下载不起作用

Question

我有一个带有 CSV 创建器和文件下载器的 php 类，它应该在创建 CSV 后下载文件。 CSV 创建器正在工作，但文件下载器没有。我不知道为什么它根本没有下载。

代码如下：

class Orders
{
    public $pdoLink,
           $timestamp;


    public function __construct()
    {
        include_once "connect.php";
        $this->pdoLink = $pdo;
        $this->timestamp = date("Y-m-d-h_i_s_a",time());
    }

    public function createCsv($begindate = false, $endDate = false)
    {

        $list = (($begindate) && ($endDate)) ? $this->getOrders($begindate,$endDate) : $this->getOrders();

        $file_name = "orders_" . $this->timestamp . ".csv";
        $file = fopen($file_name,"w");

        foreach ($list as $line)
        {
            fputcsv($file,explode(',',$line));
        }
        $this->downloadCsv($file_name);

    }
    public function downloadCsv($file)
    {
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename='.urlencode($file));
        header('Content-Transfer-Encoding: binary');
        header('Expires: 0');
        header('Cache-Control: must-revalidate');
        header('Pragma: public');
        header('Content-Length: ' . filesize($file));
        ob_clean();
        flush();
        readfile($file);
        exit;
    }
}

Answer 1

试试这个

$file = urlencode($file);
header('Content-Type: text/csv; charset=utf-8');
header("Content-Disposition: attachment; filename=\"$file\"");

Answer 2

试试这段代码

$filename = "file.csv";
        $fp = fopen('php://output', 'w');
        header('Content-type: application/csv');
        header('Content-Disposition: attachment; filename='.$filename);
        fputcsv($fp, $header_data);
        fclose($fp);
        exit;