title: Is it required to include the namespace file?
body: <p>This is what I have at hand:</p>
  
  <pre><code>//Person.php
  namespace Entity;
  
  class Person{
  
  
  }
  </code></pre>
  
  <p>User file:</p>
  
  <pre><code>//User.php
  use Entity\Person;
  
  $person = new Person;
  </code></pre>
  
  <p>Here, it fails if I don't include the <code>Person.php</code> file. If I include it, the everything works fine. Do I absolutely require to include the file even when using namespaces? If at all we need to include/require files, then how can namespaces be effectively used? Also, can we maintain folder structure by nesting namespaces?</p>