What are some best practices for masking placeholders in a PDF file using PHP?

When working with PDF files in PHP, it may be necessary to mask or hide certain placeholders or sensitive information before displaying or sharing the document. One way to achieve this is by using a PDF library such as TCPDF or FPDF to manipulate the content of the PDF file and replace placeholders with masked text. 

// Load the PDF file
$pdf = new TCPDF();
$pdf->setSourceFile('example.pdf');
$template = $pdf->importPage(1);

// Set the placeholder text to be masked
$placeholder = 'XXXX-XXXX-XXXX-XXXX';

// Replace the placeholder with masked text
$text = $pdf->Text(50, 50, str_repeat('*', strlen($placeholder)));

// Output the modified PDF
$pdf->Output('masked_example.pdf', 'D');

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