1. <?php
  3. /**
  4. * Matches patterns against datasets with defensive checks.
  5. *
  6. * @param array $dataset The dataset to search within.
  7. * @param array $patterns An array of patterns to match. Each pattern should be an array of conditions.
  8. * @return array An array of matching data points.
  9. */
  10. function matchPatterns(array $dataset, array $patterns): array
  11. {
  12. $matches = [];
  14. // Defensive check: Ensure dataset is an array
  15. if (!is_array($dataset)) {
  16. error_log("Error: Dataset must be an array.");
  17. return [];
  18. }
  20. // Defensive check: Ensure patterns is an array
  21. if (!is_array($patterns)) {
  22. error_log("Error: Patterns must be an array.");
  23. return [];
  24. }
  26. foreach ($dataset as $dataPoint) {
  27. $isMatch = true;
  29. foreach ($patterns as $pattern) {
  30. // Defensive check: Ensure pattern is an array
  31. if (!is_array($pattern)) {
  32. error_log("Error: Each pattern must be an array.");
  33. $isMatch = false; // Skip this pattern if it's invalid.
  34. continue;
  35. }
  37. $match = true;
  38. foreach ($pattern as $condition) {
  39. // Defensive check: Ensure condition is an array or scalar
  40. if (!is_array($condition) && !is_scalar($condition)) {
  41. error_log("Error: Each condition must be an array or scalar.");
  42. $match = false;
  43. break; // Stop checking this pattern if a condition is invalid.
  44. }
  46. // Apply condition. Handle different condition types.
  47. if (is_array($condition)) {
  48. //Example using array_intersect
  49. if (!array_intersect($dataPoint, $condition)) {
  50. $match = false;
  51. break;
  52. }
  53. } else {
  54. //Simple scalar comparison
  55. if ($condition !== $dataPoint) {
  56. $match = false;
  57. break;
  58. }
  59. }
  60. }
  62. if (!$match) {
  63. $isMatch = false;
  64. break; // Stop checking patterns if one fails.
  65. }
  66. }
  68. if ($isMatch) {
  69. $matches[] = $dataPoint;
  70. }
  71. }
  73. return $matches;
  74. }
  76. //Example Usage:
  77. /*
  78. $data = [
  79. ['name' => 'Alice', 'age' => 30, 'city' => 'New York'],
  80. ['name' => 'Bob', 'age' => 25, 'city' => 'London'],
  81. ['name' => 'Charlie', 'age' => 30, 'city' => 'Paris']
  82. ];
  84. $patterns = [
  85. ['age' => 30], //Match people with age 30
  86. ['city' => 'London'], //Match people from London
  87. ['age' => 25, 'city' => 'London'] //Match people with age 25 from London
  88. ];
  90. $matchingData = matchPatterns($data, $patterns);
  92. print_r($matchingData);
  93. */
  95. ?>

Add your comment