1. <?php
  3. /**
  4. * Flags anomalies in text blocks for validation checks with fallback logic.
  5. *
  6. * @param string $text The text block to analyze.
  7. * @param array $config Configuration array.
  8. * - 'keywords' => array of keywords to look for (anomalous indicators).
  9. * - 'length_threshold' => minimum/maximum length for flagging.
  10. * - 'pattern' => Regular expression for specific pattern detection.
  11. * - 'fallback_validation' => Callback function for additional validation.
  12. * @return array An array containing:
  13. * - 'anomalous' => boolean - True if anomalies are detected, false otherwise.
  14. * - 'reason' => string - Explanation of why anomalies were detected (if applicable).
  15. * - 'flagged_text' => string - The original text block.
  16. */
  17. function flagTextAnomalies(string $text, array $config): array
  18. {
  19. $anomalous = false;
  20. $reason = '';
  21. $flagged_text = $text;
  23. // Keyword check
  24. if (isset($config['keywords']) && is_array($config['keywords'])) {
  25. foreach ($config['keywords'] as $keyword) {
  26. if (stripos($flagged_text, $keyword) !== false) {
  27. $anomalous = true;
  28. $reason .= "Keyword found: " . $keyword . "\n";
  29. }
  30. }
  31. }
  33. // Length check
  34. if (isset($config['length_threshold']) && is_array($config['length_threshold'])) {
  35. $min_length = $config['length_threshold'][0];
  36. $max_length = $config['length_threshold'][1];
  38. if (strlen($flagged_text) < $min_length || strlen($flagged_text) > $max_length) {
  39. $anomalous = true;
  40. $reason .= "Length outside range: " . $min_length . "-" . $max_length . "\n";
  41. }
  42. }
  44. // Pattern check
  45. if (isset($config['pattern']) && is_string($config['pattern'])) {
  46. if (preg_match($config['pattern'], $flagged_text)) {
  47. $anomalous = true;
  48. $reason .= "Pattern detected: " . $config['pattern'] . "\n";
  49. }
  50. }
  52. // Fallback validation
  53. if (isset($config['fallback_validation']) && is_callable($config['fallback_validation'])) {
  54. $fallback_result = $config['fallback_validation']($flagged_text);
  55. if ($fallback_result) {
  56. $anomalous = true;
  57. $reason .= "Fallback validation failed.\n";
  58. }
  59. }
  62. return [
  63. 'anomalous' => $anomalous,
  64. 'reason' => $reason,
  65. 'flagged_text' => $flagged_text,
  66. ];
  67. }
  69. ?>

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