1. <?php
  3. /**
  4. * Performs a diff between two datasets of web form data.
  5. *
  6. * @param array $dataset1 The first dataset of form data.
  7. * @param array $dataset2 The second dataset of form data.
  8. * @param string $key The key to compare within each dataset entry.
  9. * @return array An array of differences, formatted as:
  10. * [
  11. * 'added' => [array of data from dataset2 that are not in dataset1],
  12. * 'removed' => [array of data from dataset1 that are not in dataset2],
  13. * 'changed' => [
  14. * [
  15. * 'key' => $key,
  16. * 'old_value' => value from dataset1,
  17. * 'new_value' => value from dataset2
  18. * ]
  19. * ]
  20. * ]
  21. */
  22. function diffDatasets(array $dataset1, array $dataset2, string $key): array
  23. {
  24. $added = [];
  25. $removed = [];
  26. $changed = [];
  28. // Find added data
  29. foreach ($dataset2 as $item) {
  30. $found = false;
  31. foreach ($dataset1 as $item1) {
  32. if ($item1[$key] === $item[$key]) {
  33. $found = true;
  34. break;
  35. }
  36. }
  37. if (!$found) {
  38. $added[] = $item;
  39. }
  40. }
  42. // Find removed data
  43. foreach ($dataset1 as $item) {
  44. $found = false;
  45. foreach ($dataset2 as $item2) {
  46. if ($item2[$key] === $item[$key]) {
  47. $found = true;
  48. break;
  49. }
  50. }
  51. if (!$found) {
  52. $removed[] = $item;
  53. }
  54. }
  56. // Find changed data
  57. foreach ($dataset1 as $item1) {
  58. $found = false;
  59. foreach ($dataset2 as $item2) {
  60. if ($item1[$key] === $item2[$key]) {
  61. $found = true;
  62. break;
  63. }
  64. }
  65. if (!$found) {
  66. // Key exists in dataset1 but not in dataset2, consider it removed.
  67. $removed[] = $item1;
  68. continue;
  69. }
  71. if ($item1[$key] !== $item2[$key]) {
  72. $changed[] = [
  73. 'key' => $key,
  74. 'old_value' => $item1[$key],
  75. 'new_value' => $item2[$key],
  76. ];
  77. }
  78. }
  80. return [
  81. 'added' => $added,
  82. 'removed' => $removed,
  83. 'changed' => $changed,
  84. ];
  85. }
  87. /**
  88. * Example Usage (replace with your actual data loading)
  89. */
  90. $dataset1 = [
  91. ['id' => 1, 'name' => 'Alice', 'email' => 'alice@example.com'],
  92. ['id' => 2, 'name' => 'Bob', 'email' => 'bob@example.com'],
  93. ];
  95. $dataset2 = [
  96. ['id' => 1, 'name' => 'Alice Smith', 'email' => 'alice.smith@example.com'],
  97. ['id' => 3, 'name' => 'Charlie', 'email' => 'charlie@example.com'],
  98. ];
  100. $diff = diffDatasets($dataset1, $dataset2, 'id');
  102. print_r($diff);
  104. ?>

Add your comment