1. <?php
  3. /**
  4. * Flags anomalies in query strings for backward compatibility.
  5. *
  6. * This function checks for potentially problematic query string parameters
  7. * and flags them as anomalies. It avoids asynchronous operations for
  8. * compatibility with older PHP versions.
  9. *
  10. * @param array $query_string An associative array representing the query string.
  11. * @param array $anomaly_rules An array of anomaly rules. Each rule is an array
  12. * with keys 'parameter' and 'regex'.
  13. * 'parameter' is the name of the parameter to check.
  14. * 'regex' is a regular expression to match.
  15. * @return array An array of flagged anomalies. Each anomaly is an associative
  16. * array with keys 'parameter' and 'message'.
  17. */
  18. function flagQueryStringAnomalies(array $query_string, array $anomaly_rules): array
  19. {
  20. $anomalies = [];
  22. foreach ($anomaly_rules as $rule) {
  23. $parameter = $rule['parameter'];
  24. $regex = $rule['regex'];
  26. if (isset($query_string[$parameter])) {
  27. if (preg_match($regex, $query_string[$parameter])) {
  28. $anomalies[] = [
  29. 'parameter' => $parameter,
  30. 'message' => "Anomaly detected: Parameter '$parameter' value matches regex '$regex'.",
  31. ];
  32. }
  33. }
  34. }
  36. return $anomalies;
  37. }
  39. // Example Usage (replace with your actual query string and rules)
  40. $query_string = [
  41. 'param1' => 'value1',
  42. 'param2' => '123abc', //Potential anomaly
  43. 'param3' => 'valid_value',
  44. 'param4' => 'some_value',
  45. ];
  47. $anomaly_rules = [
  48. ['parameter' => 'param2', 'regex' => '/[a-zA-Z]/'], // Check for non-numeric characters
  49. ['parameter' => 'param3', 'regex' => '/^[^a-zA-Z0-9_]+$/'], //Check for non-alphanumeric characters
  50. ];
  52. $anomalies = flagQueryStringAnomalies($query_string, $anomaly_rules);
  54. if (!empty($anomalies)) {
  55. echo "Anomalies detected:\n";
  56. foreach ($anomalies as $anomaly) {
  57. echo "- Parameter: " . $anomaly['parameter'] . ", Message: " . $anomaly['message'] . "\n";
  58. }
  59. } else {
  60. echo "No anomalies detected.\n";
  61. }
  63. ?>

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