1. <?php
  3. /**
  4. * Checks date constraints for data migration.
  5. *
  6. * @param string $date_string The date string to validate (e.g., 'YYYY-MM-DD').
  7. * @param string $format The expected date format (e.g., 'Y-m-d').
  8. * @param int|null $min_date Optional minimum date for validation.
  9. * @param int|null $max_date Optional maximum date for validation.
  10. * @return bool True if the date is valid and within the specified range, false otherwise.
  11. */
  12. function validateDate(string $date_string, string $format, ?int $min_date = null, ?int $max_date = null): bool
  13. {
  14. // Attempt to create a DateTime object
  15. $dateTime = DateTime::createFromFormat($format, $date_string);
  17. // Check if the date is valid
  18. if ($dateTime === false) {
  19. return false; // Invalid date format
  20. }
  22. // If min_date is specified
  23. if ($min_date !== null && $dateTime < new DateTime($min_date)) {
  24. return false; // Date is before the minimum date
  25. }
  27. // If max_date is specified
  28. if ($max_date !== null && $dateTime > new DateTime($max_date)) {
  29. return false; // Date is after the maximum date
  30. }
  32. return true; // Date is valid and within range
  33. }
  36. //Example usage
  37. /*
  38. $date = '2023-10-27';
  39. $format = 'Y-m-d';
  40. $minDate = 20230101;
  41. $maxDate = 20231231;
  43. if (validateDate($date, $format, $minDate, $maxDate)) {
  44. echo "Date is valid.\n";
  45. } else {
  46. echo "Date is invalid.\n";
  47. }
  48. */
  50. ?>

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