1. <?php
  3. function flattenConfig(array $config): array
  4. {
  5. $flattened = [];
  7. function recurse(array $current, string $prefix = '') use (&$flattened): void
  8. {
  9. foreach ($current as $key => $value) {
  10. $newKey = $prefix ? "$prefix.$key" : $key;
  12. if (is_array($value)) {
  13. recurse($value, $newKey);
  14. } else {
  15. $flattened[$newKey] = $value;
  16. }
  17. }
  18. }
  20. recurse($config);
  22. return $flattened;
  23. }
  26. function validateConfig(array $config): array
  27. {
  28. $errors = [];
  30. foreach ($config as $key => $value) {
  31. if (empty($value)) {
  32. $errors[$key] = "Value cannot be empty.";
  33. } elseif (is_string($value)) {
  34. if (strlen($value) > 255) {
  35. $errors[$key] = "String value exceeds maximum length (255 characters).";
  36. }
  37. } elseif (is_numeric($value)) {
  38. if ($value < 0) {
  39. $errors[$key] = "Numeric value cannot be negative.";
  40. }
  41. }
  42. }
  44. return $errors;
  45. }
  48. if (php_sapi_name() === 'cli') {
  49. // Example Usage (CLI)
  50. $config = [
  51. 'database' => [
  52. 'host' => 'localhost',
  53. 'port' => 3306,
  54. 'user' => 'root',
  55. 'password' => '', // Empty value for testing validation
  56. ],
  57. 'api' => [
  58. 'endpoint' => 'https://example.com/api',
  59. 'timeout' => 10,
  60. ],
  61. 'debug' => true,
  62. ];
  64. $flattenedConfig = flattenConfig($config);
  65. $validationErrors = validateConfig($flattenedConfig);
  67. if (empty($validationErrors)) {
  68. echo "Configuration is valid.\n";
  69. print_r($flattenedConfig);
  70. } else {
  71. echo "Validation errors:\n";
  72. print_r($validationErrors);
  73. }
  75. } else {
  76. // Example Usage (Web) - requires a config variable to be set.
  77. $config = [
  78. 'database' => [
  79. 'host' => 'localhost',
  80. 'port' => 3306,
  81. 'user' => 'root',
  82. 'password' => '', // Empty value for testing validation
  83. ],
  84. 'api' => [
  85. 'endpoint' => 'https://example.com/api',
  86. 'timeout' => 10,
  87. ],
  88. 'debug' => true,
  89. ];
  91. $flattenedConfig = flattenConfig($config);
  92. $validationErrors = validateConfig($flattenedConfig);
  94. if (empty($validationErrors)) {
  95. echo "Configuration is valid.\n";
  96. print_r($flattenedConfig);
  97. } else {
  98. echo "Validation errors:\n";
  99. print_r($validationErrors);
  100. }
  101. }
  103. ?>

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