[PHP-NOTES] note 130459 added to function.readfile

* context: readfile outputs html gibberish to a csv file

* environment: Linux with Litespeed

tweak to your needs

=== download function ===

class Filesystem
{
  public static function download(string $filePathName, string $mime, bool $shouldDelete)
  {
    if(file_exists($filePathName))
    {
      header('Content-Description: File Transfer');
      header("Content-Type: $mime");
      header('Content-Disposition: attachment; filename="' . basename($filePathName) . '"');
      header('Content-Transfer-Encoding: binary');
      header('Expires: 0');
      header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
      header('Pragma: public');
      header('Content-Length: ' . filesize($filePathName));

      readfile($filePathName);

    }

    clearstatcache();

    if ($shouldDelete && file_exists($filePathName))
    {
      unlink($filePathName);
    }

    throw new \Throwable('FileDownloaded');
  }
}

=== wrapper function ===

class MyController
{
  public function download($fileName)
  {
    try
    {

      FileSystem::download(
        storage_path("app/private/database/$fileName"),
        'text/csv',
        true
      );

    }
    catch (\Throwable $e)
    {

      if ($e->getMessage() == 'FileDownloaded')
      {
        // redirect back
      }

      throw $e;

    }
  }
}
----
Server IP: 45.112.84.4
Probable Submitter: 80.90.5.137 (proxied: 62.21.32.199)
----
Manual Page -- https://php.net/manual/en/function.readfile.php
Edit        -- https://main.php.net/note/edit/130459
Del: integrated  -- https://main.php.net/note/delete/130459/integrated
Del: useless     -- https://main.php.net/note/delete/130459/useless
Del: bad code    -- https://main.php.net/note/delete/130459/bad+code
Del: spam        -- https://main.php.net/note/delete/130459/spam
Del: non-english -- https://main.php.net/note/delete/130459/non-english
Del: in docs     -- https://main.php.net/note/delete/130459/in+docs
Del: other reasons-- https://main.php.net/note/delete/130459
Reject      -- https://main.php.net/note/reject/130459
Search      -- https://main.php.net/manage/user-notes.php