1. <?php
  3. /**
  4. * Hashes API response values for hypothesis validation with limited memory.
  5. *
  6. * @param array $data The API response data.
  7. * @param string $hash_algorithm The hashing algorithm to use (e.g., 'sha256', 'md5').
  8. * @param int $chunk_size The size of data chunks to process (adjust for memory limits).
  9. * @return array An associative array where keys are data element indices and values are their hashes, or an empty array on error.
  10. */
  11. function hash_api_data(array $data, string $hash_algorithm = 'sha256', int $chunk_size = 4096): array
  12. {
  13. $hashes = [];
  14. $hash = null;
  16. // Initialize the hash object based on the specified algorithm.
  17. switch (strtolower($hash_algorithm)) {
  18. case 'sha256':
  19. $hash = hash_init('sha256');
  20. break;
  21. case 'md5':
  22. $hash = hash_init('md5');
  23. break;
  24. default:
  25. return []; // Invalid algorithm
  26. }
  28. // Iterate over the data in chunks to manage memory.
  29. for ($i = 0; $i < count($data); $i += $chunk_size) {
  30. $chunk = array_slice($data, $i, $chunk_size);
  32. // Hash the chunk.
  33. if ($hash !== null) {
  34. hash_update($hash, implode('', $chunk));
  35. }
  37. // Reset the hash if it's a new chunk.
  38. if ($i > 0) {
  39. $hashes[$i - 1] = bin2hex(hash_digest($hash, '')); // Store the hash
  40. hash_reset($hash);
  41. }
  42. }
  44. // Hash the remaining data (if any).
  45. if ($hash !== null) {
  46. $hashes[$i] = bin2hex(hash_digest($hash, ''));
  47. }
  49. return $hashes;
  50. }
  52. /**
  53. * Example usage
  54. */
  55. // Sample API response data
  56. //$api_response = ['id' => 123, 'name' => 'Example', 'value' => 42, 'description' => 'This is a test'];
  58. // Hash the data using SHA-256
  59. //$hashes = hash_api_data($api_response, 'sha256');
  61. // Print the hashes
  62. //print_r($hashes);
  64. ?>

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