<?php
// Start output buffering
ob_start();
// Include necessary files
require_once '../../config.php';
// Check if student is logged in
if (session_status() === PHP_SESSION_NONE) {
session_start();
}
if (!isset($_SESSION['user_id']) || $_SESSION['role'] !== 'student') {
header("HTTP/1.1 403 Forbidden");
echo "Access denied";
exit();
}
// Get certificate number from request
$certificate_number = $_POST['certificate_number'] ?? '';
if (empty($certificate_number)) {
header("HTTP/1.1 400 Bad Request");
echo "Certificate number is required";
exit();
}
// Get the certificate from database
$query = "SELECT e.certificate_data, e.certificate_meta,
CONCAT(u.first_name, ' ', u.last_name) AS student_name,
c.title AS course_title
FROM enrollments e
INNER JOIN users u ON e.user_id = u.id
INNER JOIN courses c ON e.course_id = c.id
WHERE e.certificate_number = ? AND e.user_id = ?";
$userId = $_SESSION['user_id'];
$stmt = $conn->prepare($query);
$stmt->bind_param("si", $certificate_number, $userId);
$stmt->execute();
$result = $stmt->get_result();
if ($result && $result->num_rows > 0) {
$certificate = $result->fetch_assoc();
// Get certificate HTML
$html = $certificate['certificate_data'];
if (empty($html)) {
header("HTTP/1.1 404 Not Found");
echo "Certificate content not found";
exit();
}
// Clean up the HTML for PDF generation
$html = preg_replace('/<div class="print-(button|actions)">.*?<\/div>/s', '', $html);
try {
// First check if DOMPDF is available via composer autoload
if (file_exists('../../vendor/autoload.php')) {
require_once '../../vendor/autoload.php';
// Check if the DOMPDF classes exist
if (class_exists('\\Dompdf\\Dompdf') && class_exists('\\Dompdf\\Options')) {
// Use DOMPDF
$options = new \Dompdf\Options();
$options->set('isHtml5ParserEnabled', true);
$options->set('isPhpEnabled', true);
$options->set('isRemoteEnabled', true);
$options->set('defaultFont', 'DejaVu Sans');
// Initialize DOMPDF
$dompdf = new \Dompdf\Dompdf($options);
// Load HTML content
$dompdf->loadHtml($html);
// Set paper size and orientation
$dompdf->setPaper('A4', 'portrait');
// Render PDF
$dompdf->render();
// Generate unique filename
$filename = 'certificate_' . $certificate_number . '.pdf';
// Set headers
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="' . $filename . '"');
header('Cache-Control: max-age=0');
// Output PDF
echo $dompdf->output();
exit();
} else {
throw new Exception("DOMPDF classes not found. Please install dompdf/dompdf via Composer.");
}
} else {
throw new Exception("Vendor autoload.php not found. Please run 'composer install' in the root directory.");
}
} catch (Exception $e) {
// Log the error
error_log("PDF Generation Error: " . $e->getMessage());
// FALLBACK: If PDF generation fails, return the HTML with instructions to print as PDF
header('Content-Type: text/html');
// Add print instructions
$fallbackHTML = '<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Certificate - Print to PDF</title>
<style>
.alert {
position: fixed;
top: 0;
left: 0;
right: 0;
background-color: #f8d7da;
color: #721c24;
padding: 15px;
border: 1px solid #f5c6cb;
z-index: 9999;
text-align: center;
}
.instructions {
position: fixed;
bottom: 20px;
left: 0;
right: 0;
background-color: #cce5ff;
color: #004085;
padding: 15px;
border: 1px solid #b8daff;
z-index: 9999;
text-align: center;
}
@media print {
.alert, .instructions {
display: none;
}
}
</style>
</head>
<body>
<div class="alert">
<p>PDF generation failed: ' . htmlspecialchars($e->getMessage()) . '</p>
</div>
<div class="instructions">
<p><strong>Instructions:</strong> Please use your browser\'s print function (Ctrl+P or Cmd+P) and select "Save as PDF" to download your certificate.</p>
</div>
' . $html . '
<script>
window.onload = function() {
setTimeout(function() {
document.querySelector(".alert").style.display = "none";
}, 5000);
};
</script>
</body>
</html>';
echo $fallbackHTML;
exit();
}
} else {
header("HTTP/1.1 404 Not Found");
echo "Certificate not found";
exit();
}
?>
