1. <?php
  3. class RateLimiter {
  4. private $capacity;
  5. private $queue = [];
  6. private $lock = [];
  8. public function __construct(int $capacity) {
  9. $this->capacity = $capacity;
  10. }
  12. public function acquire(): bool {
  13. $this->lock[$this->getulatedKey()] = true; // Acquire lock
  14. if (count($this->queue) < $this->capacity) {
  15. $this->queue[] = $this->getulatedKey();
  16. return true;
  17. }
  18. return false; // Rate limit exceeded
  19. }
  21. private function getulatedKey(): string {
  22. return uniqid(); // Generate a unique key
  23. }
  24. }
  26. function flattenArray(array $array): array {
  27. $flattened = [];
  28. $queue = [$array]; // Use a queue for depth-first traversal
  30. while (!empty($queue)) {
  31. $current = array_shift($queue); // Dequeue
  33. if (is_array($current)) {
  34. foreach ($current as $value) {
  35. $queue[] = $value; // Enqueue array elements
  36. }
  37. } else {
  38. $flattened[] = $current; // Add non-array elements to the result
  39. }
  40. }
  42. return $flattened;
  43. }
  45. //Example Usage
  46. $data = [
  47. 'a' => 1,
  48. 'b' => [
  49. 'c' => 2,
  50. 'd' => [
  51. 'e' => 3,
  52. ],
  53. ],
  54. 'f' => 4,
  55. ];
  57. $flattenedData = flattenArray($data);
  59. //Rate Limiting Example
  60. $rateLimiter = new RateLimiter(5); // Allow 5 requests
  62. for ($i = 0; $i < 10; $i++) {
  63. if ($rateLimiter->acquire()) {
  64. // Process request
  65. echo "Processing request " . ($i + 1) . "\n";
  66. } else {
  67. echo "Rate limit exceeded for request " . ($i + 1) . "\n";
  68. }
  69. sleep(0.2); //Simulate work being done
  70. }
  72. ?>

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