This script is suppose to check the verification code
1. if exist in db & has not used for registration, direct to registration.php
2. if exist in db & has been used, die ('Code has expired')
3. if does not exist, die ('invalid code').

My problem is after I tried to enter a valid code, this error came out
Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\Apache Group\Apache2\htdocs\project paper\mogec project\ver.php:2) in C:\Program Files\Apache Group\Apache2\htdocs\project paper\mogec project\ver.php on line 42

What is wrong with my header??

The code goes

<?php
// Connects to your Database
mysql_connect("localhost", "root", "admin") or die(mysql_error());
mysql_select_db("project_db") or die(mysql_error());



//if the login form is submitted
if (isset($_POST['submit'])) { // if form has been submitted

// makes sure they filled it in
if(!$_POST['code']) {
die('You did not fill in the code.');
}

// checks it against the database

$check = mysql_query("SELECT * FROM code WHERE code_string = '".$_POST['code']."'")or die(mysql_error());

//Gives error if user doesn't exist
$check2 = mysql_num_rows($check);
if ($check2 == 0) {
die('Invalid code');
}

while($info = mysql_fetch_array( $check ))
{


//gives error if code has been used
if ($info['code_status'] != "") {
die('Verification Code Has Expired');

}

else
{


//then redirect them to the members area
header("Location: members.php");
}
}
}
else
{

// if they are not logged in
?>
<form action="<?php echo $_SERVER['PHP_SELF']?>" method="post">
<table border="0">
<tr><td colspan=2><h4>Enter verification Code</h4></td></tr>
<tr><td>Code:</td><td>
<input type="text" name="code" maxlength="40">
</td></tr>
<tr><td colspan="2" align="right">
<input type="submit" name="submit" value="Login">
</td></tr>
</table>
</form>
<?php
}

?>

to use header() to redirect the page, you should not print or display any output BEFORE the header() line. if you print out any output before the line, the same error would appear.
try to check your code without the header() first and see which error was printed and then move the error code below the header() line.

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