escaping ' when inside a " "

From: Adam Williams (awilliam_at_mdah.state.ms.us)
Date: 11/17/03 

Date: Mon, 17 Nov 2003 15:20:15 -0600 (CST)
To: php-general@lists.php.net

If I have the SQL statement:

$sql = "select subject from subwhile where subject = '*$var[0]*'";

do I need to put a \ before each '?