How to replace CURLOPT_POSTFIELDS with CURLFile?

Question

PHP

I needed to create a script that would work on a schedule with a VKontakte group.
After digging around on the Internet, I found a perfectly suitable solution for me.
And based on the class from this solution, I created my own script.
However, it turned out that since PHP 5.5.0, the @ prefix is ​​deprecated and in principle the script works, but the following warning is given:
Deprecated: curl_setopt(): The usage of the @filename API for file uploading is deprecated. Please use the CURLFile class instead in /........./_vk_post/primer.php on line 87
For ease of understanding line 87 is:

curl_setopt ( $ch, CURLOPT_POSTFIELDS, array( 'file1' => '@' . $file ) );

Whole class code:

class vk {
    private $token;
    private $app_id;
    private $group_id;
    private $delta;
    public function __construct( $token, $delta = 5, $app_id = 'xxxxxxx', $group_id = 'xxxxxxxx' ) {
        $this->token = $token;
        $this->delta = $delta;
        $this->app_id = $app_id;
        $this->group_id = $group_id;
    }
    public function post( $desc, $photo, $link ) {
        if( rand( 0, 99 ) < $this->delta ) {
            $data = json_decode(
                        $this->execute(
                            'wall.post',
                            array(
                                'owner_id' => -$this->group_id,
                                'from_group' => 1,
                                'message' => $desc,
                                'attachments' => 'photo-' . $this->group_id . '_' . $photo . ',' . $link
                            )
                        )
                    );
            if( isset( $data->error ) ) {
                return $this->error( $data );
            }
            return $data->response->post_id;
        }
        return 0;
    }
    public function create_album( $name, $desc ) {
        $data = json_decode(
                    $this->execute(
                        'photos.createAlbum',
                        array(
                            'title' => $name,
                            'gid' => $this->group_id,
                            'description' => $desc,
                            'comment_privacy' => 1,
                            'privacy' => 1
                        )
                    )
                );
        if( isset( $data->error ) ) {
            return $this->error( $data );
        }
        return $data->response->aid;
    }
    public function get_album_size( $id ) {
        $data = json_decode(
                    $this->execute(
                        'photos.getAlbums',
                        array(
                            'oid' => -$this->group_id,
                            'aids' => $id
                        )
                    )
                );
        if( isset( $data->error ) ) {
            return $this->error( $data );
        }
        return $data->response['0']->size;
    }
    public function upload_photo( $file, $album_id, $desc ) {
        if( !is_file( $file ) ) return false;
        $data = json_decode(
                    $this->execute(
                        'photos.getUploadServer',
                        array(
                            'aid' => $album_id,
                            'gid' => $this->group_id,
                            'save_big' => 1
                        )
                    )
                );
        if( isset( $data->error ) ) {
            return $this->error( $data );
        }
        $err['photos.getUploadServer'] = $data;
        $ch = curl_init( $data->response->upload_url );
        curl_setopt ( $ch, CURLOPT_HEADER, false );
        curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, true );
        curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, false );
        curl_setopt ( $ch, CURLOPT_POST, true );
        curl_setopt ( $ch, CURLOPT_SAFE_UPLOAD, true );
        curl_setopt ( $ch, CURLOPT_POSTFIELDS, array( 'file1' => '@' . $file ) );
        $data = curl_exec($ch);
        curl_close($ch);
        $data = json_decode( $data );
        if( isset( $data->error ) ) {
            return $this->error( $data );
        }
        $err['UploadPhoto'] = $data;
        $data = json_decode(
                    $this->execute(
                        'photos.save',
                        array(
                            'aid' => $album_id,
                            'gid' => $this->group_id,
                            'server' => $data->server,
                            'photos_list' => $data->photos_list,
                            'hash' => $data->hash,
                            'caption' => $desc
                        )
                    )
                );
        if( isset( $data->error ) ) {
            $err['photos.save'] = $data;
            return $this->error( $err );
        }
        return $data->response['0']->pid;
    }
    private function execute( $method, $params ) {
        $ch = curl_init( 'https://api.vk.com/method/' . $method . '?access_token=' . $this->token );
        curl_setopt ( $ch, CURLOPT_HEADER, false );
        curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, true );
        curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, false );
        curl_setopt ( $ch, CURLOPT_POST, true );
        curl_setopt ( $ch, CURLOPT_POSTFIELDS, $params );
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }
    private function error( $data ) {
        var_dump($data);
        return false;
    }
}

I re-read the manuals and a bunch of different options on how to solve this problem, but either the eye is already blurry, or the brain is boiling, I don’t understand how to fix this warning. Rather, while I read the manual or advice, everything seems to be clear, as I sit down to correct it, it turns out to be complete crap.
Maybe someone already solved a similar problem ???

Answer 1

curl_setopt ( $ch, CURLOPT_POSTFIELDS, array( 'file1' => '@' . $file ) );

You can't do that with 5.5.
Older versions of PHP are no longer relevant, so they no longer need to be maintained. It should also be used
instead : it makes the code more readable, does not dazzle in the eyes from .array()[])))
However, using curl in your code is bad manners.
Use Guzzle , its developers have already figured out the technical part, and you don't have to do it yourself.