title: PHP - Check if global class exists inside namespace
body: <p>How can you check if a global class exists with class_exists if you are inside the namespace of another class? For example:</p>
  
  <pre><code>&lt;?php
  namespace Rvdv\Test\Example;
  
  class ExampleClass
  {
      public function testNamespace()
      {
          // This says that it doesn't exists :(
          print class_exists('\\Test');
      }
  }
  </code></pre>
  
  <p>Where class is a global defined class.</p>