php echo iframe escape characters
===

I am having trouble finding the correct syntax for escape characters and echoing or printing an iframe output in PHP. 

   

     $youtube = $_SESSION['SESS_YOUTUBE'];
    	if($_SESSION['SESS_YOUTUBE'] == '')
    	{
    	     print "<div class=\"someClass\">Some Text Here</div>";
    	}
    	else
    	{
    	     print "<iframe id="player" width="425" height="350" src="http://www.youtube.com/embed/$youtube" frameborder="0"></iframe>";
        }

Could someone please point me in the right direction or provide me with a useful link for explaining escape characters?

Thank you.