1. <?php
  3. /**
  4. * Buffers date inputs and provides simple error messages.
  5. *
  6. * @param callable $callback A function to process the validated date. Receives a DateTime object.
  7. * @param array $dateFields An array of field names to validate.
  8. * @return array An array of errors, keyed by field name.
  9. */
  10. function bufferDateInputs(callable $callback, array $dateFields): array
  11. {
  12. $errors = [];
  13. $values = [];
  15. foreach ($dateFields as $field) {
  16. $value = $_POST[$field] ?? $_GET[$field] ?? null; //Get value from POST or GET
  17. $values[$field] = $value;
  18. }
  20. foreach ($dateFields as $field) {
  21. $value = $values[$field] ?? null; // Get the value
  23. if (empty($value)) {
  24. $errors[$field] = "This field is required.";
  25. continue;
  26. }
  28. // Attempt to create a DateTime object. Handles different date formats.
  29. try {
  30. $dateTime = new DateTime($value);
  31. } catch (Exception $e) {
  32. $errors[$field] = "Invalid date format. Please use Y-m-d or Y-m-d H:i:s.";
  33. continue;
  34. }
  36. //Optional validation - Date range check (example)
  37. if ($field === 'birthdate' && $dateTime->format('Y') > date('Y')) {
  38. $errors[$field] = "Birthdate cannot be in the future.";
  39. }
  40. }
  42. if (!empty($errors)) {
  43. return $errors;
  44. } else {
  45. $callback($values); // Call the callback with the validated values
  46. return []; // Return an empty array if no errors
  47. }
  48. }
  50. //Example usage:
  51. /**
  52. * Example function to process the validated date values.
  53. * @param array $dates An array of date values.
  54. */
  55. function processDates(array $dates) {
  56. echo "Birthdate: " . ($dates['birthdate'] ?? 'Not provided') . "<br>";
  57. }
  60. // Example call (replace with your actual form submission or GET request)
  61. // $errors = bufferDateInputs(processDates, ['birthdate', 'start_date']);
  63. // if (empty($errors)) {
  64. // // Process the validated date values
  65. // echo "Dates are valid. Processing...\n";
  66. // } else {
  67. // // Display the errors to the user
  68. // echo "<h2>Validation Errors:</h2>";
  69. // foreach ($errors as $field => $error) {
  70. // echo "- " . $field . ": " . $error . "<br>";
  71. // }
  72. // }
  74. ?>

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