using php define giving error with PW_SALT
<p>i am making a token in which i am using <code>PW_SALT</code> for that when i am using <code>define(PW_SALT,'(+3%_');</code> then its giving me error when i alert <code>use of undefined constant PW_SALT</code>. Don't know why this happening , m i missing something?</p>

<pre><code>define(PW_SALT,'(+3%_');
$row=mysql_fetch_array($sql);
$uid=$row['uid'];
$expFormat = mktime(date("H"), date("i"), date("s"), date("m")  , date("d")+3, date("Y"));  
$expDate = date("Y-m-d H:i:s",$expFormat);  
echo $key = md5($uid . '_' . $email . rand(0,10000) .$expDate . PW_SALT);
</code></pre>
