1. <?php
  3. /**
  4. * Deserializes DOM elements from input, with defensive checks.
  5. *
  6. * @param string $input The input string containing DOM element data.
  7. * @return DOMDocument|null A DOMDocument object if deserialization is successful, or null on failure.
  8. */
  9. function deserializeDomElement(string $input): ?DOMDocument
  10. {
  11. // Defensive check: Ensure input is not empty.
  12. if (empty($input)) {
  13. error_log("deserializeDomElement: Input is empty.");
  14. return null;
  15. }
  17. // Validate input format (basic check for XML-like structure)
  18. if (!preg_match('/^<[^>]+>$', $input)) {
  19. error_log("deserializeDomElement: Invalid input format.");
  20. return null;
  21. }
  23. try {
  24. // Attempt to create a DOMDocument object.
  25. $dom = new DOMDocument();
  26. $dom->loadXML($input);
  28. // Defensive check: Check if the DOMDocument was successfully loaded.
  29. if ($dom->hasErrors()) {
  30. error_log("deserializeDomElement: DOMDocument loading failed: " . $dom->formatErrors(XML_FORMAT_DEBUG_XML));
  31. return null;
  32. }
  34. return $dom;
  35. } catch (Exception $e) {
  36. error_log("deserializeDomElement: Exception during deserialization: " . $e->getMessage());
  37. return null;
  38. }
  39. }
  41. // Example Usage (for testing)
  42. /*
  43. $input = '<root><element attribute="value">Content</element></root>';
  44. $dom = deserializeDomElement($input);
  46. if ($dom) {
  47. echo "Deserialization successful.\n";
  48. print_r($dom->documentElement);
  49. } else {
  50. echo "Deserialization failed.\n";
  51. }
  52. */
  54. ?>

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