Laravel function to download files from Dropbox

DropboxController.php

public function download(Request $request, $clintId, $dtId, $inId)
{
    $path = $request->input('dropbox_file_path');
    $downloadFileName = basename($path);

    $cheaders = [
        'Authorization: Bearer ' . env('DROPBOX_BEARER_TOKEN'),
        'Content-Type: text/plain',
        'Dropbox-API-Arg: {"path":"$path"}'
    ];

    $tmpfname = tempnam(storage_path() . '/app/public/', 'DOWNLOAD_');
    $fp = fopen($tmpfname, 'w+');
    $ch = curl_init('https://content.dropboxapi.com/2/files/download');
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $cheaders);
    curl_setopt($ch, CURLOPT_FILE, $fp);
    curl_setopt($ch, CURLOPT_POSTFIELDS, '');
    $output = curl_exec($ch);
    if ($output === false) {
        echo "curl error: " . curl_error($ch);
    }
    curl_close($ch);
    fclose($fp);
    return response()->download($tmpfname, $downloadFileName, [])->deleteFileAfterSend(true);
}