1. <?php
  3. /**
  4. * Validates cookie data with fallback logic.
  5. *
  6. * @param array $expected_cookies An array of expected cookie names and their expected values.
  7. * @param array $fallback_values An array of fallback values to use if a cookie is missing or invalid.
  8. * @return array An associative array containing validated cookie values. Returns an empty array on fatal error.
  9. */
  10. function validateCookies(array $expected_cookies, array $fallback_values): array
  11. {
  12. $validated_cookies = [];
  14. foreach ($expected_cookies as $cookie_name => $expected_value) {
  15. // Check if the cookie exists
  16. if (isset($_COOKIE[$cookie_name])) {
  17. $actual_value = $_COOKIE[$cookie_name];
  19. // Validate the cookie value
  20. if ($actual_value === $expected_value) {
  21. $validated_cookies[$cookie_name] = $actual_value;
  22. } else {
  23. // Use fallback value if the cookie is invalid
  24. $validated_cookies[$cookie_name] = $fallback_values[$cookie_name] ?? null; //Use null if fallback is not defined.
  25. }
  26. } else {
  27. // Use fallback value if the cookie is missing
  28. $validated_cookies[$cookie_name] = $fallback_values[$cookie_name] ?? null; //Use null if fallback is not defined.
  29. }
  30. }
  32. return $validated_cookies;
  33. }
  35. //Example Usage:
  36. /*
  37. $expected_cookies = [
  38. 'theme' => 'dark',
  39. 'language' => 'en',
  40. 'user_id' => '123'
  41. ];
  43. $fallback_values = [
  44. 'theme' => 'light',
  45. 'language' => 'en',
  46. 'user_id' => '0'
  47. ];
  49. $validated_data = validateCookies($expected_cookies, $fallback_values);
  51. print_r($validated_data);
  52. */
  55. ?>

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