title: Unset all defined variables from the current function
body: <p>For example, I have this function:</p>
  
  <pre><code>function foo($whaaaat){
  
    $var1 = 'a';  
    $a = 1;
    $b = 2;
  
    ...
  
  
    // here unset all variables defined above (including arguments) 
    require 'somefile.php';
  }
  </code></pre>
  
  <p>So, can I unset all those variables before the require point?</p>
  
  <p>Obviously without calling unset manually on each variable, because that I figured out myself :)</p>
  
  <p>Is there some function that does this?</p>