Are there any security considerations to keep in mind when displaying PDF files in PHP from a database?

When displaying PDF files in PHP from a database, it is important to sanitize the input data to prevent SQL injection attacks. Additionally, it is recommended to set appropriate file permissions on the server to restrict access to the PDF files. Finally, consider implementing authentication and authorization checks to ensure that only authorized users can view the PDF files. 

// Sanitize input data
$pdf_id = filter_input(INPUT_GET, 'pdf_id', FILTER_SANITIZE_NUMBER_INT);

// Retrieve PDF file from the database
$query = "SELECT pdf_content FROM pdf_files WHERE id = ?";
$stmt = $pdo->prepare($query);
$stmt->execute([$pdf_id]);
$pdf_data = $stmt->fetch();

// Check if PDF file exists and user is authorized to view it
if ($pdf_data) {
    // Set appropriate headers for PDF file
    header('Content-type: application/pdf');
    header('Content-Disposition: inline; filename="file.pdf"');
    
    // Output PDF content
    echo $pdf_data['pdf_content'];
} else {
    echo 'PDF file not found or unauthorized access';
}

Keywords

PDF files PHP database security considerations display

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