title: Generating UniqueUserID with hashes
body: <p>I am trying to develop my own UniqueUserId generator, 
  I need the ID to to be in this format:</p>
  
  <pre><code>99fbf2be-d41b-4c1c-e44e-c1fde9dd4738
  </code></pre>
  
  <p>This is my code:</p>
  
  <pre><code>    &lt;?php
  
  namespace OKO\OKOUniqueUserId;
  
  use Rhumsaa\Uuid\Uuid;
  use Rhumsaa\Uuid\Exception\UnsatisfiedDependencyException;
  
  class UniqueUserId
  {
      /**
       * @var
       */
      private $uuid;
  
      /**
       * @return Uuid
       */
      public function generate()
      {
  
          try {
              $this-&gt;uuid = Uuid::uuid4();
          } catch (UnsatisfiedDependencyException $e) {
              echo 'Error Generating User Unique ID';
          }
  
          return $this-&gt;uuid;
      }
  }
  </code></pre>
  
  <p>MY OUTPYT LIKE THIS NOW: </p>
  
  <pre><code>object(Rhumsaa\Uuid\Uuid)#356 (1) { ["fields":protected]=&gt; array(6) { ["time_low"]=&gt; string(8) "d5a6efdf" ["time_mid"]=&gt; string(4) "3f09" ["time_hi_and_version"]=&gt; string(4) "416a" ["clock_seq_hi_and_reserved"]=&gt; string(2) "b6" ["clock_seq_low"]=&gt; string(2) "e8" ["node"]=&gt; string(12) "7befe7820cb7" } }
  </code></pre>
  
  <p>but I still would expect this:</p>
  
  <pre><code>25769c6c-d34d-4bfe-ba98-e0ee856f3e7a
  </code></pre>
  
  <p>thx</p>