title: How to merge multiple PDF files to one one-page PDF in PHP
body: <p>I have a bulk of small pdf files of bar-code labels. Lets say 1/4 of A4 each. What I want to do is to merge them all together so I have 4 labels per page (labels stacked 2x2 on one page). So I can print them all at once.</p>
  
  <p>Is it possible to combine pdf files like this in PHP? There are some PDF merge libraries out there but all examples are adding/removing whole pages.</p>
  
  <p>Do you have any experience with this?</p>