1. <?php
  3. /**
  4. * Collects metadata metrics with graceful failure handling.
  5. *
  6. * @param string $url The URL to analyze.
  7. * @return array|null An array of metadata metrics, or null on failure.
  8. */
  9. function collectMetadata(string $url): ?array
  10. {
  11. try {
  12. // Initialize an empty array to store metadata metrics.
  13. $metadata = [];
  15. // Use cURL to fetch the URL.
  16. $ch = curl_init($url);
  17. curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return the result as a string.
  18. curl_setopt($ch, CURLOPT_HEADER, true); // Include headers.
  19. curl_setopt($ch, CURLOPT_NOBODY, true); // Only fetch headers.
  21. $response = curl_exec($ch);
  23. if ($response === false) {
  24. error_log("cURL error: " . curl_error($ch)); // Log cURL errors.
  25. curl_close($ch);
  26. return null; // Return null on cURL failure.
  27. }
  29. curl_close($ch);
  31. // Check if the request was successful (HTTP status code 200).
  32. if (curl_getinfo($ch, CURLINFO_HTTP_CODE) != 200) {
  33. error_log("HTTP error: " . curl_getinfo($ch, CURLINFO_HTTP_CODE)); // Log HTTP errors.
  34. return null; // Return null on HTTP error.
  35. }
  37. // Decode the headers.
  38. $headers = get_headers($url);
  40. if ($headers === false) {
  41. error_log("Failed to get headers for " . $url);
  42. return null;
  43. }
  45. // Extract metadata from the headers.
  46. if (count($headers) > 0) {
  47. $metadata['content_type'] = $headers[0][0]; // Content type.
  48. $metadata['server'] = $headers[0][1]; // Server.
  49. $metadata['date'] = $headers[0][2]; // Date.
  50. } else {
  51. error_log("No headers found for " . $url);
  52. return null;
  53. }
  55. // Example: Extract the size
  56. $metadata['size'] = curl_getinfo($ch, CURLINFO_CONTENT_SIZE);
  58. return $metadata;
  60. } catch (Exception $e) {
  61. error_log("Exception: " . $e->getMessage()); // Log exceptions.
  62. return null; // Return null on exception.
  63. }
  64. }
  66. // Example usage:
  67. $url = 'https://www.example.com';
  68. $metrics = collectMetadata($url);
  70. if ($metrics !== null) {
  71. print_r($metrics); // Output the collected metrics.
  72. } else {
  73. echo "Failed to collect metadata for " . $url . "\n"; // Indicate failure.
  74. }
  76. ?>

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