title: Merging PDFs via php... the way the PDF is created is causing errors
body: <p>So we have tried every possible solution to a problem we are having.
  We have an online form that has many uploads file options. On submission, the form data is manipulated on the back end and <strong>creates a pdf using phpToPDF</strong>. Works great. We then grab all the file uploads (they have to be PDFs) and we then use another <strong>library (libmergepdf) to merge that with our own created PDFs</strong>. We have found this only works on PDFs that are of certain version types. We scrapped that for <strong>fpdf and fpdi libraries and they merged only about 80% of the time properly</strong>. We were finding that not all PDFs are created equal and those created via the "Save as PDF" in Word were not the same as those sent to the print server or even from a Mac. It wasn't an Acorbat version issue but the way it was created. 
  We have found no other options at this point but to use ImageMagick to break all the PDFs to images and then reassemble as one PDF. 
  Has anyone had any success with either libmergepdf or fpdi working on ALL PDFs? This seems like it shouldn't be this difficult but I have been around stack too many times and can't seem to find a solution. Breaking into images and recompiling seems unneeded!</p>