1. <?php
  3. class TaskQueue {
  5. private $queue = [];
  7. public function enqueue(string $dateString): bool {
  8. // Validate date string format (YYYY-MM-DD)
  9. if (!preg_match("/^\d{4}-\d{2}-\d{2}$/", $dateString)) {
  10. return false; // Invalid date format
  11. }
  13. $date = date_create($dateString);
  14. if ($date === false) {
  15. return false; // Invalid date
  16. }
  18. $this->queue[] = $dateString;
  19. return true;
  20. }
  22. public function dequeue(): ?string {
  23. if (empty($this->queue)) {
  24. return null; // Queue is empty
  25. }
  27. return array_shift($this->queue);
  28. }
  30. public function getQueueSize(): int {
  31. return count($this->queue);
  32. }
  33. }
  35. //Example usage
  36. $queue = new TaskQueue();
  38. if ($queue->enqueue('2024-03-15')) {
  39. echo "Task enqueued for 2024-03-15\n";
  40. } else {
  41. echo "Invalid date format\n";
  42. }
  44. if ($queue->enqueue('2024-03-20')) {
  45. echo "Task enqueued for 2024-03-20\n";
  46. } else {
  47. echo "Invalid date format\n";
  48. }
  50. echo "Queue size: " . $queue->getQueueSize() . "\n";
  52. $nextTask = $queue->dequeue();
  53. if ($nextTask !== null) {
  54. echo "Processing task for: " . $nextTask . "\n";
  55. } else {
  56. echo "Queue is empty\n";
  57. }
  59. echo "Queue size: " . $queue->getQueueSize() . "\n";
  61. ?>

Add your comment