1. <?php
  3. /**
  4. * Diffs two datasets of lists and performs basic sanity checks.
  5. *
  6. * @param array $dataset1 The first dataset (array of lists).
  7. * @param array $dataset2 The second dataset (array of lists).
  8. * @return array An array containing the diff results, including:
  9. * - 'added': Lists present in $dataset2 but not in $dataset1.
  10. * - 'removed': Lists present in $dataset1 but not in $dataset2.
  11. * - 'modified': Lists present in both datasets but with differences.
  12. * - 'errors': Any errors encountered during the comparison.
  13. */
  14. function diffDatasets(array $dataset1, array $dataset2): array
  15. {
  16. $added = [];
  17. $removed = [];
  18. $modified = [];
  19. $errors = [];
  21. // Helper function to compare two lists
  22. function compareLists(array $list1, array $list2): array
  23. {
  24. $diff = [];
  25. $len1 = count($list1);
  26. $len2 = count($list2);
  27. $minLen = min($len1, $len2);
  29. for ($i = 0; $i < $minLen; $i++) {
  30. if ($list1[$i] !== $list2[$i]) {
  31. $diff[] = ['index' => $i, 'value1' => $list1[$i], 'value2' => $list2[$i]];
  32. }
  33. }
  35. if ($len1 > $len2) {
  36. for ($i = $minLen; $i < $len1; $i++) {
  37. $diff[] = ['index' => $i, 'value1' => $list1[$i], 'value2' => null];
  38. }
  39. } elseif ($len2 > $len1) {
  40. for ($i = $minLen; $i < $len2; $i++) {
  41. $diff[] = ['index' => $i, 'value1' => null, 'value2' => $list2[$i]];
  42. }
  43. }
  45. return $diff;
  46. }
  48. // Check if datasets are arrays
  49. if (!is_array($dataset1) || !is_array($dataset2)) {
  50. $errors[] = ['type' => 'invalid_input', 'message' => 'Datasets must be arrays.'];
  51. return ['added' => [], 'removed' => [], 'modified' => [], 'errors' => $errors];
  52. }
  54. // Iterate through the first dataset
  55. foreach ($dataset1 as $list1) {
  56. $found = false;
  57. foreach ($dataset2 as $list2) {
  58. if ($list1 === $list2) {
  59. $found = true;
  60. break;
  61. }
  62. }
  63. if (!$found) {
  64. $removed[] = $list1;
  65. }
  66. }
  68. // Iterate through the second dataset
  69. foreach ($dataset2 as $list2) {
  70. $found = false;
  71. foreach ($dataset1 as $list1) {
  72. if ($list1 === $list2) {
  73. $found = true;
  74. break;
  75. }
  76. }
  77. if (!$found) {
  78. $added[] = $list2;
  79. }
  80. }
  82. // Find modified lists
  83. foreach ($dataset1 as $list1) {
  84. foreach ($dataset2 as $list2) {
  85. if ($list1 === $list2) {
  86. $modified[] = compareLists($list1, $list2);
  87. break;
  88. }
  89. }
  90. }
  92. return [
  93. 'added' => $added,
  94. 'removed' => $removed,
  95. 'modified' => $modified,
  96. 'errors' => $errors,
  97. ];
  98. }
  100. /**
  101. * Example Usage
  102. */
  103. /*
  104. $dataset1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
  105. $dataset2 = [[1, 2, 3], [4, 5, 7], [10, 11, 12]];
  107. $diff = diffDatasets($dataset1, $dataset2);
  109. print_r($diff);
  110. */
  113. ?>

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