1. <?php
  3. /**
  4. * Caches web form results for internal tooling.
  5. *
  6. * This function takes form data and stores the results in a cache
  7. * for later retrieval. This avoids redundant processing of
  8. * the same form data, improving performance.
  9. *
  10. * @param array $formData The form data as an associative array.
  11. * @param string $cacheKey A unique key for the cache entry.
  12. * @param int $cacheExpiryTime Time to live for the cache entry in seconds. Defaults to 3600 (1 hour).
  13. * @param callable $resultCallback A function that takes the form data and returns the result.
  14. * @return array|null The result of the resultCallback or null if the data is not cached.
  15. */
  16. function cacheFormResults(array $formData, string $cacheKey, int $cacheExpiryTime = 3600, callable $resultCallback): ?array
  17. {
  18. // Define the cache store (using a simple array for demonstration. Consider using a more robust cache system like Redis or Memcached in production).
  19. static $cache = [];
  21. // Check if the data is already in the cache.
  22. if (isset($cache[$cacheKey])) {
  23. // Data found in cache, and it hasn't expired.
  24. $cachedResult = $cache[$cacheKey];
  26. // Check if the cache entry has expired.
  27. if ($cachedResult['expiry'] > time()) {
  28. // Cache entry is valid.
  29. return $cachedResult['result'];
  30. } else {
  31. // Cache entry has expired. Remove it.
  32. unset($cache[$cacheKey]);
  33. }
  34. }
  36. // If data not found in cache or expired, calculate the result.
  37. $result = $resultCallback($formData);
  39. // Store the result in the cache with an expiry time.
  40. $cache[$cacheKey] = [
  41. 'result' => $result,
  42. 'expiry' => time() + $cacheExpiryTime,
  43. ];
  45. return $result;
  46. }
  49. /**
  50. * Example usage: Simulates a form submission and retrieves the result.
  51. */
  52. function processForm(array $formData): array
  53. {
  54. // Simulate some form processing.
  55. sleep(1); // Simulate a time-consuming operation
  57. // Example: Check if a required field is present.
  58. if (empty($formData['name'])) {
  59. return ['error' => 'Name is required'];
  60. }
  62. // Simulate some calculation.
  63. $result = [
  64. 'message' => 'Form processed successfully!',
  65. 'data' => $formData,
  66. ];
  67. return $result;
  68. }
  72. // Example usage:
  73. $form_data = [
  74. 'name' => 'John Doe',
  75. 'email' => 'john.doe@example.com',
  76. 'age' => 30,
  77. ];
  79. $cache_key = 'form_result_' . md5(json_encode($form_data)); //Generate a unique key based on the form data
  81. $result = cacheFormResults($form_data, $cache_key, 60, 'processForm'); //Cache for 60 seconds
  83. if ($result !== null) {
  84. echo "Result: " . json_encode($result) . "\n";
  85. } else {
  86. echo "No result found in cache.\n";
  87. }
  90. //Demonstrate retrieving the cached result
  91. $form_data2 = [
  92. 'name' => 'John Doe',
  93. 'email' => 'john.doe@example.com',
  94. 'age' => 30,
  95. ];
  97. $cache_key2 = 'form_result_' . md5(json_encode($form_data2)); //Generate a unique key based on the form data
  99. $result2 = cacheFormResults($form_data2, $cache_key2, 60, 'processForm'); //Retrieve the result from the cache
  101. if ($result2 !== null) {
  102. echo "Result from cache: " . json_encode($result2) . "\n";
  103. } else {
  104. echo "No result found in cache.\n";
  105. }
  106. ?>

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