1. <?php
  3. /**
  4. * Flattens a nested configuration array.
  5. *
  6. * @param array $config The nested configuration array.
  7. * @param string $prefix The prefix for the flattened keys (optional).
  8. * @param array $flattened The flattened array (output).
  9. * @return array The flattened array.
  10. */
  11. function flattenConfig(array $config, string $prefix = '', array &$flattened = []): array
  12. {
  13. foreach ($config as $key => $value) {
  14. $newKey = $prefix ? $prefix . '.' . $key : $key;
  16. if (is_array($value)) {
  17. // Recursively flatten nested arrays
  18. flattenConfig($value, $newKey, $flattened);
  19. } else {
  20. // Add the key-value pair to the flattened array
  21. $flattened[$newKey] = $value;
  22. }
  23. }
  25. return $flattened;
  26. }
  28. // Example usage:
  29. /*
  30. $config = [
  31. 'server' => [
  32. 'host' => 'localhost',
  33. 'port' => 8080,
  34. ],
  35. 'database' => [
  36. 'host' => 'db.example.com',
  37. 'port' => 5432,
  38. 'user' => 'admin',
  39. 'password' => 'secure_password',
  40. ],
  41. 'logging' => [
  42. 'level' => 'info',
  43. 'file' => '/var/log/app.log',
  44. ],
  45. ];
  47. $flattenedConfig = flattenConfig($config);
  49. print_r($flattenedConfig);
  50. */
  52. ?>

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