1. <?php
  3. /**
  4. * Aggregates date values and handles potential errors.
  5. *
  6. * @param array $dates An array of date strings in 'YYYY-MM-DD' format.
  7. * @return array An associative array with the count of each date. Returns an empty array on error.
  8. */
  9. function aggregateDates(array $dates): array
  10. {
  11. $dateCounts = [];
  13. foreach ($dates as $dateString) {
  14. // Validate the date format
  15. if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $dateString)) {
  16. echo "Error: Invalid date format - " . $dateString . "\n";
  17. return []; // Return empty array on error
  18. }
  20. // Check if the date is valid (optional, but recommended)
  21. if (checkdate(intval(substr($dateString, 0, 4)), intval(substr($dateString, 5, 2)), intval(substr($dateString, 8, 2)))) {
  22. if (isset($dateCounts[$dateString])) {
  23. $dateCounts[$dateString]++;
  24. } else {
  25. $dateCounts[$dateString] = 1;
  26. }
  27. } else {
  28. echo "Error: Invalid date - " . $dateString . "\n";
  29. return []; // Return empty array on error
  30. }
  31. }
  33. return $dateCounts;
  34. }
  36. // Example Usage
  37. $dateArray = ["2023-10-26", "2023-10-27", "2023-10-26", "2023-10-28", "invalid-date", "2023-10-27"];
  38. $aggregatedDates = aggregateDates($dateArray);
  40. if (!empty($aggregatedDates)) {
  41. echo "<pre>";
  42. print_r($aggregatedDates);
  43. echo "</pre>";
  44. }
  47. ?>

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