php

// Filter the posted variables

$username = ereg_replace("[^A-Za-z0-9]", "", $_POST['username']); // filter everything but numbers and letters

$country = ereg_replace("[^A-Z a-z0-9]", "", $_POST['country']); // filter everything but spaces, numbers, and letters

$state = ereg_replace("[^A-Z a-z0-9]", "", $_POST['state']); // filter everything but spaces, numbers, and letters

$city = ereg_replace("[^A-Z a-z0-9]", "", $_POST['city']); // filter everything but spaces, numbers, and letters

$accounttype = ereg_replace("[^a-z]", "", $_POST['accounttype']); // filter everything but lowercase letters

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

$email = strip_tags($email);

$email = mysql_real_escape_string($email);

$password = ereg_replace("[^A-Za-z0-9]", "", $_POST['password']); // filter everything but numbers and letters