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12. Cookies, Sign-ins, and Ditching Crummy Pop-ups > Logging In with Cookies
You know what cookies are. You know the flow of the sign-in form. Now it’s time to code. Create signin.php and start with the basic outline:
<?php
require_once '../scripts/database_connection.php';
require_once '../scripts/view.php';
// If the user is logged in, the user_id cookie will be set
if (!isset($_COOKIE['user_id'])) {
// See if a login form was submitted with a username for login
if (isset($_REQUEST['username'])) {
// Try and log the user in
$username = mysql_real_escape_string(trim($_REQUEST['username']));
$password = mysql_real_escape_string(trim($_REQUEST['password']));
// Look up the user
// If user not found, issue an error
}
// Still in the "not signed in" part of the if
// Start the page, and we know there's no success or error message
// since they're just logging in
page_start("Sign In");
?>
<html>
<div id="content"....
