1. <?php
  3. /**
  4. * Removes duplicate strings from an array, handling edge cases.
  5. *
  6. * @param array $stringArray The input array of strings.
  7. * @return array The array with duplicates removed, preserving original order.
  8. */
  9. function removeDuplicateStrings(array $stringArray): array
  10. {
  11. if (empty($stringArray)) {
  12. return []; // Handle empty array case
  13. }
  15. $uniqueStrings = [];
  16. $seen = []; // Use an associative array for efficient lookup
  18. foreach ($stringArray as $string) {
  19. if (!in_array($string, $seen)) {
  20. $uniqueStrings[] = $string;
  21. $seen[] = $string;
  22. }
  23. }
  25. return $uniqueStrings;
  26. }
  28. //Example usage and testing
  29. if (PHP_SAPI === 'cli') {
  30. // Test cases
  31. $testCases = [
  32. ['apple', 'banana', 'apple', 'orange', 'banana'],
  33. [''],
  34. ['a', 'a', 'a'],
  35. [],
  36. ['apple'],
  37. ['apple', 'Apple', 'apple'], // Case sensitivity test
  38. ['apple', 'banana', 'orange', 'grape', 'apple', 'banana']
  39. ];
  41. foreach ($testCases as $testCase) {
  42. $result = removeDuplicateStrings($testCase);
  43. print_r($result . PHP_EOL);
  44. }
  45. }
  47. ?>

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