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My code: <?php include("db.php"); if (isset($_POST['username']) && isset($_POST['password']) && isset($_POST['email'])) //Prevent SQL injections $username = mysql_real_escape_string($_POST['username']); $email = mysql_real_escape_string($_POST['email']); //Get MD5 hash of password $password = md5($_POST['password']); //Check to see if username exists $sql = mysql_query("SELECT username FROM usersystem WHERE username = '".$username."'"); if (mysql_num_rows($sql)>0) { die ("Username taken."); } … 
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