In PHP, we have open source library for PDF file generation called FPDF. There is an extension of the library: FPDI that allows for manipulating PDF files.
FPDI extracts the content of the pdf as a template, allows us to change the content and then output the changed pdf as a new pdf file.
There is no install. We need to download and include fdpf.php and fdpi.php libraries in our php script as would be demonstrated in the examples below:
Example 1: Creating your first PDF from the php code
Example 2: Changing the content of the PDF
$pdf =& new FPDI();
//Set the source PDF file
$pagecount = $pdf->setSourceFile(“existing_pdf.pdf”);
//Import the first page of the file
$tpl = $pdf->importPage(1);
//Use this page as template
// use the imported page and place it at point 20,30 with a width of 170 mm
$pdf->useTemplate($template, 20, 30, 170);
#Print Hello World at the bottom of the page
//Select Arial italic 8
$pdf->Write(0, “Hello World”);
The above code in example 2 takes a PDF file “existing_pdf.pdf”, and creates a copy of it “modified_pdf.pdf” with “Hello World” printed.