1. <?php
  3. /**
  4. * Matches HTTP headers against predefined patterns.
  5. *
  6. * This function provides a simple way to test if HTTP headers
  7. * match specific patterns without requiring extensive configuration.
  8. *
  9. * @param array $headers An associative array of HTTP headers.
  10. * @param array $patterns An array of header patterns. Each pattern
  11. * is an associative array with keys:
  12. * - 'header': The header name (string).
  13. * - 'pattern': A regular expression pattern (string).
  14. * - 'match_type': 'contains' or 'exact' (string).
  15. * @return array An array of matching headers. Each element contains the
  16. * matching header and its corresponding pattern. Returns
  17. * an empty array if no matches are found.
  18. */
  19. function matchHeaders(array $headers, array $patterns): array
  20. {
  21. $matches = [];
  23. foreach ($patterns as $pattern) {
  24. $headerName = $pattern['header'];
  25. $patternRegex = $pattern['pattern'];
  26. $matchType = $pattern['match_type'];
  28. if (isset($headers[$headerName])) {
  29. $headerValue = $headers[$headerName];
  31. if ($matchType === 'contains') {
  32. if (preg_match($patternRegex, $headerValue)) {
  33. $matches[] = ['header' => $headerName, 'pattern' => $patternRegex];
  34. }
  35. } elseif ($matchType === 'exact') {
  36. if ($headerValue === $patternRegex) {
  37. $matches[] = ['header' => $headerName, 'pattern' => $patternRegex];
  38. }
  39. }
  40. }
  41. }
  43. return $matches;
  44. }
  46. //Example usage
  47. /*
  48. $headers = [
  49. 'Content-Type' => 'application/json',
  50. 'X-Custom-Header' => 'somevalue',
  51. 'Server' => 'Apache/2.4.41',
  52. 'Date' => 'Wed, 21 May 2023 12:00:00 GMT'
  53. ];
  55. $patterns = [
  56. ['header' => 'Content-Type', 'pattern' => '/application\/json/', 'match_type' => 'contains'],
  57. ['header' => 'Server', 'pattern' => '/Apache/', 'match_type' => 'contains'],
  58. ['header' => 'Date', 'pattern' => '/Wed/', 'match_type' => 'contains'],
  59. ['header' => 'X-Custom-Header', 'pattern' => 'somevalue', 'match_type' => 'exact']
  60. ];
  62. $matches = matchHeaders($headers, $patterns);
  64. print_r($matches);
  65. */
  67. ?>

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