1. <?php
  3. /**
  4. * Simple HTTP response caching for scheduled runs.
  5. *
  6. * @param callable $callback A function that returns an HTTP response object.
  7. * @param string $cache_file The file to store the cached results.
  8. * @param int $cache_duration The cache duration in seconds (default: 3600).
  9. * @return mixed The cached response, or the result of the callback if no cache exists.
  10. */
  11. function cache_http_response(callable $callback, string $cache_file, int $cache_duration = 3600)
  12. {
  13. // Check if the cache file exists.
  14. if (file_exists($cache_file)) {
  15. // Read the cached response from the file.
  16. $cached_response = file_get_contents($cache_file);
  18. // If the cache is expired, clear it.
  19. if (time() - filemtime($cache_file) > $cache_duration) {
  20. file_delete($cache_file);
  21. $cached_response = null;
  22. }
  24. // Decode the cached response (assuming it's JSON).
  25. if ($cached_response !== null) {
  26. $cached_response = json_decode($cached_response, true);
  27. }
  28. }
  30. // If a cached response exists and is valid, return it.
  31. if ($cached_response !== null) {
  32. return $cached_response;
  33. }
  35. // Otherwise, execute the callback and cache the result.
  36. $response = $callback();
  38. // Encode the response to JSON and write it to the cache file.
  39. file_put_contents($cache_file, json_encode($response));
  41. return $response;
  42. }
  44. /**
  45. * Example usage:
  46. *
  47. * Define a function that makes an HTTP request.
  48. *
  49. * function get_data_from_api() {
  50. * // Your HTTP request logic here
  51. * $response = file_get_contents("https://example.com/api/data");
  52. * return $response;
  53. * }
  54. *
  55. * // Cache the results of the HTTP request.
  56. * $cached_data = cache_http_response(
  57. * 'get_data_from_api',
  58. * 'cache/api_data.json',
  59. * 86400 // Cache for 24 hours
  60. * );
  61. *
  62. * // Use the cached data.
  63. * echo $cached_data;
  64. */
  66. ?>

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