1. <?php
  3. /**
  4. * Initializes DOM element components for data migration, supporting older versions.
  5. *
  6. * @param string $tag The DOM element tag name.
  7. * @param array $attributes An associative array of attributes to set.
  8. * @param array $initial_data Initial data to populate the element with.
  9. * @param string $version The version of the data being migrated from.
  10. * @return DOMElement|null The initialized DOM element, or null on failure.
  11. */
  12. function initializeDOMElement(string $tag, array $attributes, array $initial_data, string $version): ?DOMElement
  13. {
  14. // Ensure DOMDocument is available
  15. if (!class_exists('DOMDocument')) {
  16. error_log('DOMDocument class not found. DOM manipulation might not be possible.');
  17. return null;
  18. }
  20. try {
  21. // Create a new DOM element
  22. $element = new DOMElement($tag);
  24. // Set attributes. Handle older versions that might not support all attributes.
  25. foreach ($attributes as $attribute => $value) {
  26. // Check if the attribute is supported. This is a basic compatibility check.
  27. if (is_supportedAttribute($tag, $attribute, $version)) {
  28. $element->setAttribute($attribute, $value);
  29. } else {
  30. //Log unsupported attribute (optional)
  31. error_log("Attribute '$attribute' not supported for tag '$tag' in version $version.");
  32. }
  33. }
  35. // Populate the element with initial data. Handle different data types.
  36. if (!empty($initial_data)) {
  37. foreach ($initial_data as $key => $value) {
  38. $element->appendChild(createTextNode($value)); //Use text nodes for simplicity. Consider more complex handling for other data types.
  39. }
  40. }
  42. return $element;
  44. } catch (Exception $e) {
  45. error_log("Error initializing DOM element: " . $e->getMessage());
  46. return null;
  47. }
  48. }
  50. /**
  51. * Helper function to determine if an attribute is supported based on the tag and version.
  52. * This is a placeholder for a more robust compatibility check.
  53. * @param string $tag
  54. * @param string $attribute
  55. * @param string $version
  56. * @return bool
  57. */
  58. function is_supportedAttribute(string $tag, string $attribute, string $version): bool
  59. {
  60. //Example: Older versions might not support 'class' attribute on some tags.
  61. if ($tag === 'div' && $version === '1.0') {
  62. return false;
  63. }
  64. return true; //Default to supported.
  65. }
  67. /**
  68. * Helper function to create a text node.
  69. * @param mixed $value
  70. * @return DOMTextNode
  71. */
  72. function createTextNode($value): DOMTextNode
  73. {
  74. $node = new DOMTextNode($value);
  75. return $node;
  76. }
  80. ?>

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