QR Code Reader / Decoder using PHP Library

scan data martix 2D again . thank you.

where is the process shown on the thumbnail??

I get this error
call to undefined function Zxing\\imagecreatefromstring()

Hi! the qr reader works perfectly but i want to implement that the user can submit a qr code. there is way to do that with an Input "File"?

With out composer is imposible use this library?