i'm confused and don't know what to do

[muchexie]

i have developed a log in system which is a starting point for my online learning system i'm developing.
i'm failing to log in possibly the system is not able to register a user as a valid user.The system is not reflecting error warnings.
Here is a code section where i'm suspecting a fault.


function login($username , $passwd)
// check username and password with db
// if yes, return true
// else return false
{
// connect to db
$conn = db_connect();
if (!$conn)
return 0;

// check if username is unique
$result = mysql_query("se lect * from users
where username = '$username'
and passwd = '$passwd'");
if (!$result)
return 0;

if (mysql_num_rows ($result)>0)
return 1;
else
return 0;
}

function check_valid_use r()
// see if somebody is logged in and notify them if not
{
global $valid_user;
if (session_is_reg istered("valid_ user"))
{
echo "Logged in as $valid_user.";
echo "<br>";
}
else
{
// they are not logged in
do_html_heading ("Problem:") ;
echo "You are not logged in.Please try again.<br>";
do_html_url("lo gin.php", "Login");
//do_html_footer( );
exit;
}
}


<?
session_start() ;
// include function files for this application
require_once("s ystem_fns.php") ;
if (isset($usernam e) && isset($passwd))
// they have just tried logging in
{
if (login($usernam e, $passwd))
{
// if they are in the database register the user id
$valid_user = $username;
session_registe r("valid_user") ;
}
}
check_valid_use r();
// give menu of options
display_user_me nu();
?>


Please help to get out of this situation

[ronverdonk]

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