if($_SESSION[' logged_in'] == 1)
{
//REDIRECT TO HOMEPAGE
header('Locati on: http://www.buyn pay.com/ . $_SERVER['HTTP _HOST'] . '');
} else {

if(isset($HTTP_ POST_VARS['sub mit']))
{



//BEGIN CHECKING USERNAME...
if(!$_POST['us ername']) die('Alert: username field was blank.');

//array of invalid characters
$junk = array('.' , ',' , '/' , '\' , '`' , ';' , '[' , ']' , '-', '_', '*', '&', '^', '%', '$', '#', '@', '!', '~', '+', '(', ')', '|', '{', '}', '<', '>', '?', ':', '"', '=');

//starting lenght of username
$len = strlen($_POST[ 'username']);

//replace invalid characters
$_POST['userna me'] = str_replace($ju nk, '', $_POST['userna me']);
$test = $_POST['userna me'];

//if lenghts are different ($len smaller), invalid characters found, so prompt error.
if(strlen($test ) != $len) {
die('Username Error: Username contained invalid characters. You can only use A-Z, 0-9 and the

underscore (_).');
}



//Check if username already exists...
$q2 = mysql_query(&q uot;SELECT * FROM `members` WHERE `username` = '".$_POS T['username'] ."');
$q3 = mysql_fetch_obj ect($q2);

if($q3->user name == $_POST['userna me']) {
die('<BR&g t;<BR>Sor ry, but the username "'.$q3-& gt;username.' " is taken, please choose another.');
}



if(!$_POST['pa ssword']) {
die('Error: Password field was blank');
}
if(!$_POST['ve rify_password' ]) {
die('Error: Verify Password field was blank.');
}
if($_POST['pas sword'] != $_POST['verify _password']) {
die('Error: The passwords do not match.');
}
if(strlen($_POS T['password'] ) < 6 ) {
die('Error: Your password is too short. Must be 6 or more characters in length.');
}



$insert ="INSERT INTO `members` (username, user_password, user_email) VALUES ('".$_PO ST['username' ]."',

'".md5($ _POST['passwor d'])."' , '".$_POS T['email'].& quot;')" ;

$insert2 = mysql_query($in sert);
if(!$insert2) die(mysql_error ());

echo('Registra tion Successful, Welcome new member! You can now login to your new account.');

} else {
?>


<table>
<form name="sig nup" action="& lt;? $_SERVER['PHP_ SELF']; ?>" method="P OST">
<tr>
<td>Usern ame: <BR> (only A-Z, 0-9 and _ Allowed)<BR& gt;</td>
<td><i nput type="tex t" id ="usernam e" name="use rname" value="& quot; maxlength=&quo t;30"> <BR></ td>
</tr>
<tr>
<td>Passw ord:</td>
<td><i nput type="pas sword" id="passw ord" name="pas sword" value="& quot; maxlength=&quo t;30"> <BR> (minimum 6

characters)< /td>
</tr>
<tr>
<td>Verif y Pass:</td> ;
<td><i nput type="pas sword" id="verif y_password&quo t; name="ver ify_password&q uot; value="& quot; maxlength=&quo t;30"> <BR>

</td>
</tr>
<tr>
<td>Email :</td>
<td><i nput type="tex t" id="email " name="ema il" value="& quot; size="30 "><b r></td> ;
</tr>
<tr>
<td>Click to Complete Signup:</td& gt;
<td><i nput type="sub mit" id="submi t" name="sub mit" value="su bmit"> </td>
</tr>
</form>
</table>
<?
} //end not logged in
} //end submit not pressed
?>