What is $$ in php?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/2715654/what-does-mean-in-php">What does $$ mean in PHP?</a><br>
  <a href="http://stackoverflow.com/questions/4179489/double-dollar-sign-php">Double dollar sign php</a>  </p>
</blockquote>



<p>What is $$ in php. 
This question is asked in a recent interview for a web developer position.
Thanks in advance!</p>
