title: Redeclaring variables in PHP
body: <p>Is it necessary to empty variables before reassigning them?</p>
  
  <p>For example, I have an object 'user'.</p>
  
  <pre><code>$random_user = new User();
  </code></pre>
  
  <p>If I declare several $random_users, the object will not keep its old values, it will just be entirely rewritten correct? </p>