Custom web site php, mysql - step 2

Second step for the previous project. The attached pdf files, contain the next step forward to do for this project. “invoice [login to view URL]” and "invoice sample more pages" contain the explanation of how you have to create the pdf for each invoice (fatture or proforma it’s the same result, change only the empty template to use). “empty invoice [login to view URL]” is the empty template you can use to create the pdf (for the moment use it for fattura and proforma but i want to change it in the future without modify any php code line). I suggest you to use a free pdf library for pdf creation, not important what, but it’s important that it’s free. Budget 100$.