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a Set class that maintains an array of unique items

/ Published in: PHP
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  1. <?php
  2. class Set
  3. {
  4. 	protected $_storage_array;
  5.  
  6. 	function __constructor()
  7. 	{
  8. 		$this->_storage_array = array();
  9. 	}
  10.  
  11. 	function add($value)
  12. 	{
  13. 		$this->_storage_array[$value] = $value;
  14. 	}
  15.  
  16. 	function hasValue($value)
  17. 	{
  18. 		return in_array($value, array_keys($this->_storage_array));
  19. 	}
  20.  
  21. 	function toArray()
  22. 	{
  23. 		return array_keys($this->_storage_array);
  24. 	}
  25. }
  26.  
  27. $data = new Set;
  28. $data->add("Sarah");
  29. $data->add("Jamie");
  30. $data->add("Phil");
  31. $data->add("Jamie");
  32.  
  33. print("Has Value Jamie? " . ($data->hasValue("Jamie") ? 'true' : 'false')) . PHP_EOL;
  34. print_r($data->toArray());
  35.  
  36. /*
  37. Returns the following:
  38.  
  39. Has Value Jamie? true
  40. Array
  41. (
  42.     [0] => Sarah
  43.     [1] => Jamie
  44.     [2] => Phil
  45. )
  46. */
  47. ?>

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