1. <?php
  3. /**
  4. * Removes duplicate date values from an array.
  5. *
  6. * @param array $dates An array of date strings (e.g., 'YYYY-MM-DD').
  7. * @return array An array with unique dates, maintaining original order.
  8. */
  9. function removeDuplicateDates(array $dates): array {
  10. $uniqueDates = []; // Initialize an array to store unique dates.
  12. foreach ($dates as $date) {
  13. // Basic sanity check: ensure the value is a string
  14. if (!is_string($date)) {
  15. continue; // Skip non-string values
  16. }
  18. // Check if the date is already in the uniqueDates array
  19. if (!in_array($date, $uniqueDates, true)) { // strict comparison
  20. $uniqueDates[] = $date; // Add the date to the uniqueDates array
  21. }
  22. }
  24. return $uniqueDates;
  25. }
  27. //Example usage
  28. /*
  29. $dateArray = ['2023-10-26', '2023-10-27', '2023-10-26', '2023-10-28', '2023-10-27'];
  30. $uniqueArray = removeDuplicateDates($dateArray);
  31. print_r($uniqueArray); // Output: Array ( [0] => 2023-10-26 [1] => 2023-10-27 [2] => 2023-10-28 )
  32. */
  34. ?>

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