1. <?php
  3. /**
  4. * Hashes file contents with fallback logic.
  5. *
  6. * @param string $filePath The path to the file.
  7. * @param string $algorithm The hashing algorithm to use (md5, sha1, sha256, fallback). Defaults to sha256.
  8. * @return string|false The hash value, or false on failure.
  9. */
  10. function hashFileContents(string $filePath, string $algorithm = 'sha256'): string|false
  11. {
  12. if (!file_exists($filePath)) {
  13. return false; // File does not exist
  14. }
  16. $fileContent = file_get_contents($filePath);
  18. if ($fileContent === false) {
  19. return false; // Failed to read file
  20. }
  22. switch ($algorithm) {
  23. case 'md5':
  24. $hash = md5($fileContent);
  25. break;
  26. case 'sha1':
  27. $hash = sha1($fileContent);
  28. break;
  29. case 'sha256':
  30. $hash = hash('sha256', $fileContent);
  31. break;
  32. case 'fallback':
  33. //Try md5, then sha1, then sha256
  34. $hash = md5($fileContent);
  35. if ($hash === false) {
  36. $hash = sha1($fileContent);
  37. if ($hash === false) {
  38. $hash = hash('sha256', $fileContent);
  39. }
  40. }
  41. break;
  42. default:
  43. return false; // Invalid algorithm
  44. }
  46. return $hash;
  47. }
  49. //Example usage:
  50. // $hash = hashFileContents('my_file.txt', 'sha256');
  51. // if ($hash !== false) {
  52. // echo "Hash: " . $hash . "\n";
  53. // } else {
  54. // echo "Hashing failed.\n";
  55. // }
  57. ?>

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