1. <?php
  3. /**
  4. * Flags anomalies in collections for routine automation with fallback logic.
  5. *
  6. * @param array $collection The collection to analyze.
  7. * @param array $thresholds An array of thresholds for anomaly detection. Key is the metric name, value is the threshold.
  8. * @param string $anomaly_level The level of anomaly to flag ('high', 'medium', 'low').
  9. * @return array An array of flagged anomalies with details.
  10. */
  11. function flagCollectionAnomalies(array $collection, array $thresholds, string $anomaly_level = 'medium'): array
  12. {
  13. $anomalies = [];
  15. foreach ($collection as $item) {
  16. foreach ($thresholds as $metric => $threshold) {
  17. // Check if the metric exists in the item
  18. if (isset($item[$metric])) {
  19. $value = $item[$metric];
  21. // Anomaly detection logic (example: comparing to threshold)
  22. if ($value > $threshold) {
  23. $anomaly_details = [
  24. 'item' => $item,
  25. 'metric' => $metric,
  26. 'value' => $value,
  27. 'threshold' => $threshold,
  28. 'level' => $anomaly_level,
  29. 'reason' => "Value exceeds threshold",
  30. ];
  31. $anomalies[] = $anomaly_details;
  32. } elseif ($value < $threshold) {
  33. $anomaly_details = [
  34. 'item' => $item,
  35. 'metric' => $metric,
  36. 'value' => $value,
  37. 'threshold' => $threshold,
  38. 'level' => $anomaly_level,
  39. 'reason' => "Value falls below threshold",
  40. ];
  41. $anomalies[] = $anomaly_details;
  42. }
  43. }
  44. }
  45. }
  47. // Fallback logic: If no anomalies are found, return a message.
  48. if (empty($anomalies)) {
  49. $anomalies[] = [
  50. 'message' => 'No anomalies detected.',
  51. 'level' => 'low',
  52. ];
  53. }
  55. return $anomalies;
  56. }
  58. //Example Usage (Can be removed for standalone code)
  59. /*
  60. $data = [
  61. ['temperature' => 28, 'humidity' => 60],
  62. ['temperature' => 30, 'humidity' => 65],
  63. ['temperature' => 25, 'humidity' => 55],
  64. ];
  66. $thresholds = ['temperature' => 27, 'humidity' => 62];
  68. $anomalies = flagCollectionAnomalies($data, $thresholds, 'high');
  70. print_r($anomalies);
  71. */
  72. ?>

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