密码保护对于PHP中的pdf

Question

Developing an Admin page, in which admins uploads PDF and user downloads that PDF. After user downloads PDF, the PDF has to ask password, how to set password for that PDF automatically in php and that PDF should not set by Admin

This is my Admin Page Code

  move_uploaded_file($tmp_name, $location);
if (copy($location, $location1)) {

    $query = mysqli_query($conn, "SELECT * FROM `at_uploads` WHERE  name='$name1'");
    if (mysqli_num_rows($query) > 0) {

        echo("<SCRIPT LANGUAGE='JavaScript'>
                     window.alert('File already exists with that name')
                     window.location.href='upload';
                      </SCRIPT>");
    }
}

This is my user download page

if(isset($_GET['dow'])) {

$filepath1 = $_GET['dow'];

$query = mysqli_query($conn, "SELECT * FROM `at_uploads` WHERE filepath1 ='$filepath1'");
while (($row = mysqli_fetch_array($query))) {

    $name=$row['name'];
    $location = "C:/wamp/www/school/admin/files/" . $name;
    header('Content-Type: application/pdf');

    header('Content-Disposition: attachment; filename="' . basename($location) . '"');
    header('Content-Length: ' . filesize($location));
    readfile($location);
      }
  }

I don't know where to set password for pdf

Answer 1

Which library are you using? If you are using FPdi, please use the function below.

<?php

function pdfEncrypt ($origFile, $password, $destFile){
//include the FPDI protection http://www.setasign.de/products/pdf-php-solutions/fpdi-protection-128/
require_once('fpdi/FPDI_Protection.php');

$pdf =& new FPDI_Protection();
// set the format of the destinaton file, in our case 6×9 inch
$pdf->FPDF('P', 'in', array('6','9'));

//calculate the number of pages from the original document
$pagecount = $pdf->setSourceFile($origFile);

// copy all pages from the old unprotected pdf in the new one
for ($loop = 1; $loop <= $pagecount; $loop++) {
    $tplidx = $pdf->importPage($loop);
    $pdf->addPage();
    $pdf->useTemplate($tplidx);
}

// protect the new pdf file, and allow no printing, copy etc and leave only reading allowed
$pdf->SetProtection(array(),$password);
$pdf->Output($destFile, 'F');

return $destFile;
}

//password for the pdf file
$password = '[e-mail]';

//name of the original file (unprotected)
$origFile = 'yourfilename.pdf';

//name of the destination file (password protected and printing rights removed)
$destFile ='yourfilename.pdf';

//encrypt the book and create the protected file
pdfEncrypt($origFile, $password, $destFile );
?>