1. <?php
  3. /**
  4. * Validates date values with fallback logic.
  5. *
  6. * @param string $date_string The date string to validate.
  7. * @param string $format The expected date format (e.g., 'Y-m-d', 'm/d/Y').
  8. * @param string $fallback_format The fallback date format to attempt if the primary format fails.
  9. * @param int $fallback_attempts The number of attempts to use the fallback format.
  10. * @param string $default_date The date to use if all attempts fail.
  11. *
  12. * @return DateTime|null A DateTime object if the date is valid, null otherwise.
  13. */
  14. function validateDate(string $date_string, string $format, string $fallback_format, int $fallback_attempts = 1, string $default_date = '1970-01-01'): ?DateTime
  15. {
  16. $dateTime = DateTime::createFromFormat($format, $date_string);
  18. if ($dateTime === false) {
  19. // Try fallback format
  20. for ($i = 1; $i <= $fallback_attempts; $i++) {
  21. $dateTime = DateTime::createFromFormat($fallback_format, $date_string);
  22. if ($dateTime !== false) {
  23. break; // Fallback successful
  24. }
  25. }
  27. if ($dateTime === false) {
  28. // Fallback failed, use default date
  29. $dateTime = DateTime::createFromFormat($fallback_format, $default_date);
  30. if ($dateTime === false) {
  31. return null; // Default failed too
  32. }
  33. }
  34. }
  36. return $dateTime;
  37. }
  39. //Example Usage:
  40. /*
  41. $date_string = '2024-10-27';
  42. $format = 'Y-m-d';
  43. $fallback_format = 'm/d/Y';
  44. $default_date = '1900-01-01';
  46. $dateTime = validateDate($date_string, $format, $fallback_format, 2, $default_date);
  48. if ($dateTime) {
  49. echo "Valid Date: " . $dateTime->format('Y-m-d') . "\n";
  50. } else {
  51. echo "Invalid Date\n";
  52. }
  53. */
  56. ?>

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