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Help with a class, header, redirects

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Hi All.

i wouldnt be asking unless i was totally stummped. but my functionality produces the following error:

Warning: Cannot modify header information - headers already sent by (output started at /home/staff/public_html/Cfg_Files/clsBilling.php:84) in /home/staff/public_html/Billing/index.php on line 23


[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]<?php
class Billing {
var $db_link;
var $db_prefix;
var $db_host;
var $db_user;
var $db_pass;
var $db_db;
var $usr_Password;
var $usr_Email;
var $usr_AccessLevel;
var $usr_AccessLevelID;
var $usr_LoggedIn;
var $query_rows;
var $query_result;
var $firstresult;

function Billing(){

$this->db_host = "localhost";
$this->db_user = "staff_clients";
$this->db_pass = "xxxxxx";
$this->db_db = "staff_clients";

} //main function

function Encrypt_string($string){
$enc_string = md5($string);
return $enc_string;
} //Encrypt Function

function DBOpen(){
mysql_connect($this->db_host, $this->db_user, $this->db_pass) or die ("failed connection due to: " . mysql_error());
} //Database Connection Open

function DBClose(){
} //Database Connection Close

function DBQuery($cmdText){


$result = mysql_query($cmdText);
$numRows = mysql_num_rows($result);
$firstResult = mysql_result($result, 0);

$this->query_rows = $numRows;
$this->firstresult = $firstResult;


} //Database Query Function

function LogInUser($email, $password)
$enc_pass = $this->Encrypt_string($password);
$cmdText = "SELECT AccessLevelID FROM tblClients WHERE Email = '$email' AND Password = '$enc_pass'";

if($this->query_rows !== '0'){
$this->AccessLevelID = $this->firstresult;


$this->usr_Password = $enc_pass;
$this->usr_Email = $email;
$this->usr_LoggedIn = '1';

} else {
$this->usr_LoggedIn = '0';
} //login function

function SetAccessLevel(){
$accesslevelid = $this->AccessLevelID;

$cmdText = "Select AccessLeveName From tblAccessLevels WHERE AccessLevelID = $accesslevelid";

$this->AccessLevel = $this->firstresult;
} //Get AccessLevel Function
?> [/quote]


[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]<?php

$mode = $_GET['mode'];

if($mode == 'login'){

$billing = new billing;

$email = $_POST['txtEmail'];
$password = $_POST['txtPassword'];

$billing->LogInUser($email, $password);

if($billing->usr_LoggedIn == '1'){

$_SESSION['billing_obj'] = $billing;

if($billing->usr_AccessLevel == "Administrator"){
header("location: admin/index.php");
} else {
header("location: user/index.php");

} else {
$error = "Invalid Email Address And/Or Password!";


if anyone could/would shed some light on this, theyd have a new best freind lol

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Maybe you have the same problem I had once...
In the included file, I accidently added a white space after the closing "?>". And a white space is somekind of outout, so I got the "headers already sent" error.
So- Make sure you have no white spaces before/after the code, in both files.


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