title: How to work with infinity arguments in a function (like PHP's isset())
body: <p>You know how PHP's <code>isset()</code> can accept multiple (no limit either) arguments?</p>
  
  <p>Like I can do:</p>
  
  <pre><code>isset($var1,$var2,$var3,$var4,$var5,$var6,$var7,$var8,$var9,$var10,$var11);
  //etc etc
  </code></pre>
  
  <p>How would I be able to do that in my own function? How would I be able to work with infinity arguments passed?</p>
  
  <p>How do they do it?</p>