how to call CURLOPT_PROGRESSFUNCTION from controller

I am using curl inside Controller to download a file. I would like to display a progress while file is downloading. I've read about that here: http://stackoverflow.com/questions/13958303/curl-download-progress-in-php

these two lines are needed:

curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, 'progress');
curl_setopt($ch, CURLOPT_NOPROGRESS, false);

I've placed them inside a function in my controller but I am getting this error: curl_exec(): Cannot call the CURLOPT_PROGRESSFUNCTION

I am suspecting that it's not working because it can't call it like progress() it should call it like $this->progress(). Is that correct? How do I specify this if my assumption is correct, if not what am I doing wrong?

NXTLevel

8 years ago

Level 1

Hey Guys!

got the same problem! PHP sample on webspace works fine, but in Laravel 5.4 can't get it to work!

stwilson

8 years ago

Level 16

To use the callback inside a class, you need to do it like this:

curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, array($this, 'progress'));

or if using static functions, like this:

curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, array('self', 'progress'));

... to a callback function to do whatever you need:

public static function progress($resource, $downloadSize, $downloaded, $uploadSize, $uploaded)
{
    // emit the progress
    Cache::put('download_status', [
        'resource' => $resource,
        'download_size' => $downloadSize,
        'downloaded' => $downloaded,
        'upload_size' => $uploadSize,
        'uploaded' => $uploaded
    ], 10);

}

If you need to pass additional arguments, you can use an anonymous function like so (it's ugly):

curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, function ($resource, $downloadSize, $downloaded, $uploadSize, $uploaded) use ($additionalArgument) {
    $this->progress($resource, $downloadSize, $downloaded, $uploadSize, $uploaded, $additionalArgument);
});

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