1. <?php
  3. /**
  4. * Verifies the integrity of metadata for batch processing.
  5. * Handles potential edge cases like missing fields, incorrect data types, and invalid values.
  6. *
  7. * @param array $metadata An array of metadata for each item in the batch.
  8. * @param array $requiredFields An array of required metadata fields.
  9. * @return array An array of errors found during validation. Empty array if validation passes.
  10. */
  11. function validateMetadata(array $metadata, array $requiredFields): array
  12. {
  13. $errors = [];
  15. foreach ($metadata as $index => $item) {
  16. $itemErrors = [];
  18. foreach ($requiredFields as $field) {
  19. if (!isset($item[$field])) {
  20. $itemErrors[] = "Missing required field: " . $field;
  21. } elseif (empty($item[$field])) {
  22. $itemErrors[] = "Field '" . $field . "' cannot be empty.";
  23. } else {
  24. // Type validation and value checks
  25. $expectedType = null;
  26. $allowedValues = [];
  28. switch ($field) {
  29. case 'id':
  30. $expectedType = 'int';
  31. break;
  32. case 'status':
  33. $expectedType = 'string';
  34. $allowedValues = ['pending', 'processing', 'completed', 'failed'];
  35. break;
  36. case 'timestamp':
  37. $expectedType = 'int'; // Unix timestamp
  38. break;
  39. case 'data_type':
  40. $expectedType = 'string';
  41. $allowedValues = ['image', 'video', 'audio', 'text'];
  42. break;
  43. default:
  44. // Add more field type and value checks as needed
  45. break;
  46. }
  48. if ($expectedType !== null) {
  49. if (!is_int($item[$field]) && $expectedType === 'int') {
  50. $itemErrors[] = "Field '" . $field . "' must be an integer.";
  51. } elseif (!is_string($item[$field]) && $expectedType === 'string') {
  52. $itemErrors[] = "Field '" . $field . "' must be a string.";
  53. } elseif (!is_numeric($item[$field]) && $expectedType === 'float') {
  54. $itemErrors[] = "Field '" . $field . "' must be a number.";
  55. }
  56. }
  58. if (is_array($allowedValues) && !in_array($item[$field], $allowedValues)) {
  59. $itemErrors[] = "Field '" . $field . "' has an invalid value. Allowed values: " . implode(', ', $allowedValues);
  60. }
  61. }
  62. }
  64. if (!empty($itemErrors)) {
  65. $errors[] = [
  66. 'index' => $index,
  67. 'errors' => $itemErrors,
  68. ];
  69. }
  70. }
  72. return $errors;
  73. }
  75. // Example Usage (replace with your actual data)
  76. //$metadata = [
  77. // ['id' => 1, 'status' => 'processing', 'timestamp' => 1678886400, 'data_type' => 'image'],
  78. // ['id' => 2, 'status' => 'completed', 'timestamp' => 1678886460, 'data_type' => 'video'],
  79. // ['status' => '', 'timestamp' => 1678886520, 'data_type' => 'audio'], //Missing id and empty status
  80. // ['id' => 'abc', 'status' => 'pending', 'timestamp' => 1678886580, 'data_type' => 'text'], //Invalid id type
  81. // ['id' => 3, 'status' => 'invalid_status', 'timestamp' => 1678886640, 'data_type' => 'image'], //Invalid status
  82. //];
  83. //$requiredFields = ['id', 'status', 'timestamp', 'data_type'];
  85. // $validationErrors = validateMetadata($metadata, $requiredFields);
  87. // if (empty($validationErrors)) {
  88. // echo "Metadata is valid.\n";
  89. // } else {
  90. // echo "Validation errors:\n";
  91. // foreach ($validationErrors as $error) {
  92. // echo "Index: " . $error['index'] . ", Errors: " . implode(", ", $error['errors']) . "\n";
  93. // }
  94. // }

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