How can PHP be effectively used to read and manipulate PDF metadata, specifically ModifyDate or CreationDate?

To read and manipulate PDF metadata such as ModifyDate or CreationDate in PHP, you can use a library like TCPDF or FPDI. These libraries allow you to extract metadata from PDF files and modify them as needed. By parsing the PDF file using these libraries, you can access and update the desired metadata fields. 

require_once('tcpdf/tcpdf.php');

$pdf = new TCPDF();
$pdf->setSourceFile('example.pdf');
$info = $pdf->getInfo();

// Get the ModifyDate
$modifyDate = $info['ModDate'];

// Update the ModifyDate
$modifyDate = date('Y-m-d H:i:s');
$pdf->setInfo('ModDate', $modifyDate);

$pdf->Output('modified_example.pdf', 'F');

Keywords

PHP PDF metadata ModifyDate CreationDate

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