Using mpdf in PHP, open print dialog box in a new tab

I am creating a report in PHP using mPDF Library. Till now the output is saved as a pdf file which I need to print out manually by opening the auto downloaded file. What I need is as soon as I click on Print button on my PHP Web page, mPDF should create the output and immediately print the document using default printer. I even donot need any intermediate dialog box that would again get a confirmation to print. Simply, clicking on PHP based web page button should send the print command to the default printer. I have tried the following code: $mpdf->SetJS('[login to view URL]();'); This solution comes up with two problems: 1. It still opens a dialog for print confirmation. 2. It opens the print preview and the dialog box in my current tab which means that on clicking print, I cannot get the same interface on which I was working before clicking Print. For that, I have to click on back button on the browser which is not a good solution. Another task is to launch the php project as a desktop application instead of running it from a browser.