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why will this code not work?

session_start();

if(isset($_SESSION['member_id']))

{

header("Location:index.php");//redirects to the home page

} // ends isset session

//insert the connection script and end the script if the connection fails

require_once '../../../../../inc_connect.php';

//function to store password as a hashed value

function randomString()

{

$string = md5(rand());

return $string;

}

//initially there are no erros

$error = false;

//check if form s submitted

if(isset($_POST['register']))

{

$fname = mysql_real_escape_string($_POST['fname']);

$lname = mysql_real_escape_string($_POST['lname']);

$email = mysql_real_escape_string($_POST['email']);

$password = mysql_real_escape_string($_POST['password']);

$cpassword = mysql_real_escape_string($_POST['cpassword']);

//validate form data

//fname can contain only letters and spaces

if(!preg_match('/^[a-zA-Z\s]+$/',$fname))

{

$error = true;

//message to member if error occurs

$fname_error = "Name must contain only letters and spaces";

}

//lname can contain only letters and spaces

if(!preg_match('/^[a-zA-Z\s]+$/',$lname))

{

$error = true;

//message to member if error occurs

$lname_error = "Name must contain only letters and spaces";

}

//validate email to valid maine account

if(!preg_match('/^[a-zA-Z\.]+@(unit\.maine|maine)\.edu/', $email))

{

$error = true;

//message to member if error occurs

$email_error = "Please enter a valid University account.";

}// ends email

//text striing with at lease one Number and one Character between 6 and 10 characters

if(strlen($password) < 7)

{

$error = true;

$password_error = "Password must be minimum of 7 characters.";

}

if($password != $cpassword)

{

$error = true;

//messare to member if error occurs

$cpassword_error = "Password and Comfirm Password do not match.";

}

if(!$error)

{

//hash and salt the password to make it more secure

$hash = "";

$password = $_POST['password'];

$salt = randomString();

$hash = md5($password.$salt);

$TableName = "members"; //assign the table name to a variable

//insert posted data to the mebers table

$SQLString = "INSERT INTO $TableName " .

"(fname, lname, password_hash, password_salt) VALUES" .

"('$fname', '$lname', '$email', '$hash', '$salt')";

$QueryResults = @mysql_query($SQLString, $DBConnect);

if($QueryResults)

{

//message on successful registration

$successmsg = "Successfully Registered! Click here to Login";

}//ends if QR

else

{

//message on uncuccessful registration

echo mysql_error();

$errormsg = "Error in registering... Pleae try again later!.";

}//ends else QR

}//ends if !$error

}//ends isset for register

?>

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Register

First Name

$fname_error

";?>

Last Name

$lname_error

";?>

Email

required value="">

$email_error

";?>

Password

required value="">

$password_error

";?>

Comfirm Password

required value="">

$cpassword_error

";?>

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