What are the limitations of using PHP to manipulate PDF forms, especially when it comes to read-only restrictions?

PHP has limitations when it comes to manipulating PDF forms with read-only restrictions. One way to work around this limitation is to use a library like TCPDF or FPDI to import the PDF form, modify it, and then save it as a new PDF file. This allows you to bypass the read-only restrictions and make changes to the form fields programmatically. 

// Include the TCPDF library
require_once('tcpdf/tcpdf.php');

// Create new PDF document
$pdf = new TCPDF();

// Import existing PDF form
$pdf->setSourceFile('existing_form.pdf');
$tplIdx = $pdf->importPage(1);

// Add a new page
$pdf->AddPage();

// Use imported form as template
$pdf->useTemplate($tplIdx, 0, 0);

// Modify form fields
$pdf->SetFont('helvetica', '', 12);
$pdf->SetTextColor(0, 0, 0);
$pdf->SetXY(50, 50);
$pdf->Write(0, 'New value for form field');

// Save the modified PDF
$pdf->Output('modified_form.pdf', 'F');

Keywords

PHP PDF forms limitations read-only restrictions manipulation

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