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I have a user registration page that requires the user to input a Username, Password, Confirm Password, Email. If the user passes all the validation requirements for the new account, I then need to have the username, password, email fields saved to a file called 'login.dat' Here is my code that I have so far, it runs perfectly. <?php include 'helpfulfunctions.inc'; include 'productsdata.inc'; $user_login_file = 'login.dat'; //var_dump($_POST); // product data for photo, name, and price. $alluserinfo = load_users_info($user_login_file); //validate users info $errors = array(); if (array_key_exists('register_submit', $_POST)) { //check to see if username is taken $username_entered = $_POST['username']; //check to see if username already exists if (array_key_exists($username_entered, $alluserinfo)) { $errors['username']['username_exists'] = "Username already exists."; } //validate username is 4-11 characters long using only a-z A-Z 0-9 if(preg_match("/^[0-9a-zA-z]{4,11}$/",$_POST['username']) ===0){ $errors['username']['invalid_username']= "Invalid username. Username must be 4-11 characters long and use only letters and numbers."; } //validate password "." means any character //.* allows numbers 0-9 to be inserted anywhere //?= positive lookahead: next text must be like this and follow these rules // must be at least 6 characters, contain 0-9, a-z, A-Z $pw_entered=$_POST['password']; if(preg_match("/^.*(?=.{6,})(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).*$/", $_POST["password"]) === 0){ $errors['password']['invalid_password']="Password must be at least 6 characters and must contain at least one lower case letter, one upper case letter and one digit."; } //validate that "confirm password" matches password above $pw_repeat=$_POST['confirmpassword']; if($pw_repeat != $pw_entered){ $errors['confirmpassword']['pw_no_match']="Passwords do not match. Try again."; } //validate email format $email_entered=($_POST['email']); if(!filter_var($email_entered, FILTER_VALIDATE_EMAIL)){ $errors['email']['invalid_email']="Not a valid email. Please try again."; } //no validation errors=>print invoice if (empty($errors)) { include 'invoice.inc'; exit; } } //reprint if invalid entry. if no errors print invoice ?> <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"> <h3>Please register to continue.</h3> <table> <tr> <td> *Username: </td> <td> <input type="text" name="username"/> <?php if (isset($errors['username'])) { print implode('<br>', $errors['username']); } ?> </td> </tr> <tr> <td> *Password: </td> <td> <input type="password" name="password"/> <?php if (isset($errors['password'])) { print implode('<br>', $errors['password']); } ?> </td> </tr> <tr> <td> *Confirm Password: </td> <td> <input type="password" name="confirmpassword"/> <?php if (isset($errors['confirmpassword'])) { print implode('<br>', $errors['confirmpassword']); } ?> </td> </tr> <tr> <td> *Email: </td> <td> <input type="text" name="email"/> <?php if (isset($errors['email'])) { print implode('<br>', $errors['email']); } ?> </td> </tr> <tr> <td> * required info <br> <input type="submit" value="Register" name="register_submit"> <?php //print out hiddens with quantities save_hidden_qty($_POST['quantity']); ?> </form> </td> </tr> </table> In case it's needed, this is the 'helpfulfunctions.inc' file and the included functions: <?php if (!function_exists('load_users_info')) { function load_users_info($users_data_file) { $fp = fopen($users_data_file, 'r'); //read all lines of login.dat file and create user info arrays while (!feof($fp)) { $users_info_line = fgets($fp); $user_info_parts = explode(',', $users_info_line); $user_info_array = array('username' => $user_info_parts[0], 'password' => $user_info_parts[1], 'email' => $user_info_parts[2]); $complete_user_info_array[$user_info_array['username']] = $user_info_array; } fclose($fp); return $complete_user_info_array; } } // function to display products if (!function_exists('display_products')) { function display_products($products_to_display, $quantities = array()) { global $errors; ?> <table border="1"> <tbody> <tr> <td style="text-align: center;"><b><big>Product</big></b></td> <td style="text-align: center;"><b><big>Brand</big></b></td> <td style="text-align: center;"><b><big>Price(each)</big></b></td> <td style="text-align: center;"><b><big>Quantity Desired</big></b></td> </tr> <?php // quantities are 0 unless already inputted, if quantities previously were inputted, return the values. // input boxes for ($i = 0; $i < count($products_to_display); $i++) { if (empty($quantities)) { $qty = isset($_POST['quantity'][$i]) ? $_POST['quantity'][$i] : 0; $qty_str = "<input type=text size=3 maxlength=3 name='quantity[$i]' value='$qty'>"; if (isset($errors['quantity'][$i])) { $qty_str .= "<span style='font-style:italic;font-size:8px;color:red;'>{$errors['quantity'][$i]}</span>"; } } else { $qty_str = $quantities[$i]; } // loop to print out table of photo of board, name of the brand, price, and quantity selected printf(' <tr> <td><img alt="Small" id="lightboxImage" style="width: 119px; height: 88px; bgcolor="#cccccc;" src="http://imgur.com/%s" height="300" width="300"></td> <td style="text-align: center;">%s</td> <td style="text-align: center;">$%.2f</td> <td style="text-align: center;">' . $qty_str . '</td> </tr> ', $products_to_display[$i]['item'], $products_to_display[$i]['board'], $products_to_display[$i]['price']); } ?> <tr><td colspan="4" style="text-align: right; border: none"> <input type="submit" value="Purchase"></td></tr> </tbody> </table> <?php } } if (!function_exists('save_hidden_qty')) { function save_hidden_qty($the_quantities){ foreach ($the_quantities as $key=>$value){ print "<input type='hidden' name='quantity[$key]' value='$value'>\n"; } } } ?> Can anyone help me out?