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   1  <?php
   2  
   3  class Stripe_Util_Set
   4  {
   5    private $_elts;
   6  
   7    public function __construct($members=array())
   8    {
   9      $this->_elts = array();
  10      foreach ($members as $item)
  11        $this->_elts[$item] = true;
  12    }
  13  
  14    public function includes($elt)
  15    {
  16      return isset($this->_elts[$elt]);
  17    }
  18  
  19    public function add($elt)
  20    {
  21      $this->_elts[$elt] = true;
  22    }
  23  
  24    public function discard($elt)
  25    {
  26      unset($this->_elts[$elt]);
  27    }
  28  
  29    // TODO: make Set support foreach
  30    public function toArray()
  31    {
  32      return array_keys($this->_elts);
  33    }
  34  }