title: Detect prefixes / operators from inside the function
body: <p>Example:</p>
  
  <pre><code>function foo($whatever){
    // ... do stuff here
  }
  
  // call the function
  +foo(1234);
  </code></pre>
  
  <p>Can I find out from within my function if it was called with <code>+</code> (or <code>-</code>, <code>!</code> etc) ?</p>