Assigning variables to CONST

I am having a problem assigning variables to constants in a class. I am using Authorize.net AIM class and want to assign the login and transaction key that is stored in a database. However, it doesn’t allow it and in the code below, I have to use the actual string to make it work.

Can someone help me out on how to make this work with the const variables?

Thanks in advance.

[CODE]
<?php
include(“../include/connectionString.php”);
$query = mysql_query(“SELECT * FROM admin”);
while ($get = mysql_fetch_array($query)) {
$login = $get[‘authnetLogin’];
$transKey = $get[‘authnetTranskey’];
}

class AuthnetAIMException extends Exception {}

class AuthnetAIM
{

const LOGIN = ‘123456’;
const TRANSKEY = ‘123456’;

//trying to assign variables here from query above….
// const LOGIN = $login;
// const TRANSKEY = $transKey;

const TEST = false;
const GODADDY = false;

private $params = array();
private $results = array();
private $approved = false;
private $declined = false;

..rest of code

[/CODE]

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