1. <?php
  3. /**
  4. * Deduplicates DOM elements within a given DOM node.
  5. *
  6. * @param DOMNode $node The DOM node to process.
  7. * @param bool $strict Whether to perform a strict comparison (===). Defaults to true.
  8. * @param bool $recursive Whether to process child nodes recursively. Defaults to true.
  9. * @return DOMNode The modified DOM node.
  10. */
  11. function deduplicateDOMElements(DOMNode $node, bool $strict = true, bool $recursive = true): DOMNode
  12. {
  13. if (!$node instanceof DOMNode) {
  14. return $node; // or throw an exception
  15. }
  17. if ($recursive) {
  18. foreach ($node->childNodes as $child) {
  19. $node = deduplicateDOMElements($child, $strict, $recursive);
  20. }
  21. }
  23. $elements = [];
  24. $newChildren = [];
  26. foreach ($node->childNodes as $child) {
  27. if ($child instanceof Element) {
  28. $isDuplicate = false;
  29. foreach ($elements as $element) {
  30. if ($strict) {
  31. if ($element === $child) {
  32. $isDuplicate = true;
  33. break;
  34. }
  35. } else {
  36. //Loose comparison
  37. if ($element == $child) {
  38. $isDuplicate = true;
  39. break;
  40. }
  41. }
  42. }
  43. if (!$isDuplicate) {
  44. $elements[] = $child;
  45. $newChildren[] = $child;
  46. }
  47. } else {
  48. $newChildren[] = $child; // Keep non-element nodes
  49. }
  50. }
  52. $node->appendChild($Document->createElement('fragment')); // Create a fragment to hold the new children
  53. $fragment = $node->firstChild;
  54. foreach ($newChildren as $child) {
  55. $fragment->appendChild($child);
  56. }
  58. return $node;
  59. }
  61. //Example Usage
  62. /*
  63. $Document = new DOMDocument();
  64. $element = $Document->createElement('div');
  65. $element->appendChild($Document->createElement('p'));
  66. $element->appendChild($Document->createElement('p'));
  67. $element->appendChild($Document->createElement('span'));
  68. $element->appendChild($Document->createElement('span'));
  70. $node = $Document->appendChild($element);
  72. $deduplicatedNode = deduplicateDOMElements($node);
  74. echo $deduplicatedNode->outerHTML;
  76. */
  77. ?>

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