1. <?php
  3. /**
  4. * Flattens a nested array structure with basic input validation.
  5. *
  6. * @param array $data The input array to flatten.
  7. * @return array The flattened array. Returns an empty array on invalid input.
  8. */
  9. function flattenArray(array $data): array
  10. {
  11. if (!is_array($data)) {
  12. return []; // Handle non-array input.
  13. }
  15. $flattened = [];
  17. function flatten(array $arr, string $prefix = ""): void
  18. {
  19. foreach ($arr as $key => $value) {
  20. $newKey = $prefix ? $prefix . "." . $key : $key;
  22. if (is_array($value)) {
  23. flatten($value, $newKey); // Recursive call for nested arrays
  24. } else {
  25. // Basic validation: Ensure value is not null or empty string
  26. if ($value !== null && $value !== "") {
  27. $flattened[$newKey] = $value;
  28. }
  29. }
  30. }
  31. }
  33. flatten($data);
  34. return $flattened;
  35. }
  37. // Example usage (for testing):
  38. /*
  39. $nestedArray = [
  40. 'name' => 'John Doe',
  41. 'age' => 30,
  42. 'address' => [
  43. 'street' => '123 Main St',
  44. 'city' => 'Anytown',
  45. 'zip' => '12345'
  46. ],
  47. 'hobbies' => ['reading', 'hiking'],
  48. 'null_value' => null,
  49. 'empty_string' => '',
  50. 'nested_array' => [
  51. 'level1' => [
  52. 'level2' => 'value'
  53. ]
  54. ]
  55. ];
  57. $flattenedArray = flattenArray($nestedArray);
  59. print_r($flattenedArray);
  60. */
  63. ?>

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