删除后将文件内容作为新文件下载返回

Question

I have two php functions that are called upon consecutive requestes:

This is called on the first request:

public static function ProcessResponseFile($request_file_content)
{
    session_start();
    $temp_file = tempnam("./tmp", "file"); 
    file_put_contents($temp_file, $request_file_content);
    $_SESSION['request_response'] = $temp_file;
    return file_get_contents($temp_file);
}

The following function is called on the second request:

public static function GetResponseFileContent()
{
    session_start(); 
    $filename = $_SESSION['request_response'];
    $handle = fopen($filename, "r");
    $response_content = fread($handle, filesize($filename));
    fclose($handle);
   // $response_content = file_get_contents($_SESSION['request_response']);
    unlink($_SESSION['request_response']);
    unset($_SESSION['request_response']);
    return $response_content;
}

The $response_content is empty. If I comment the unlink and unset, I get the appropriate file contents. Why is that ?

I want to download the returned value of GetResponseFileContent()

if (isset($_POST['submit_download'])) {

    ob_end_clean();
    header("Cache-Control: public");
    header("Content-Description: File Transfer");
    header("Content-Disposition: attachment; filename=raspuns.xml");
    header("Content-Type: application/octet-stream; "); 
    header("Content-Transfer-Encoding: binary");

    session_start();
    echo Application::GetResponseFileContent();

}

Answer 1

Before you can use ob_end_clean(), you have to use ob_start(). Otherwise, there's no output buffer to clear out.