Help with a "remember me" checkbox in PHP

Got an Auto Indexer open source author Justin Hagstrom

Needed to add an “remember me” function. Did a tutorial but I"m getting an error at first I couldn’t see my page turns out it was a missing bracket now I’m getting a broken code. The login works but it’s breaking in the remember me checkbox.

Here’s the website link http://www.mesc.org/gatedTEST/index.php

Here’s my code in the index.php:

$log_login = false;

if (USE_LOGIN_SYSTEM && isset($_POST['username'], $_POST['password']) && $_POST['username'] != '' && $_POST['password'] != '')
  {
  $you = new UserLoggedIn($_POST['username'], sha1($_POST['password']));
  $log_login = true;
  $_SESSION['password'] = sha1($_POST['password']);
  unset($_POST['password']);
  $_SESSION['username'] = $_POST['username'];
  }
  else
if (USE_LOGIN_SYSTEM && isset($_SESSION['username'], $_SESSION['password']))
  {
  $you = new UserLoggedIn($_SESSION['username'], $_SESSION['password']);
  }
  else
if (USE_LOGIN_SYSTEM && isset($_COOKIE['username'], $_COOKIE['password']))
  {
  $you = new UserLoggedIn($_COOKIE['username'], $_COOKIE['password']);
  }
  else
  {
  $you = new User();
  if (MUST_LOGIN_TO_DOWNLOAD && USE_LOGIN_SYSTEM)
    {
    $str = '<p>You must login to view and download files. </p>' . '<table border="0" cellpadding="8" cellspacing="0">' . '<tr class="paragraph"><td class="autoindex_td">' . $you->login_box() . '</td></tr></table>';
    echo new Display($str);
    die();
    }
  }

if (!empty($_POST["remember"]))
  {
  setcookie("user", $_POST["username"], time() + (10 * 365 * 24 * 60 * 60));
  setcookie("pass", $_POST["password"], time() + (10 * 365 * 24 * 60 * 60));
  }
  else
  {
  if (isset($_COOKIE["user"]))
    {
    setcookie("user", "");
    }

  if (isset($_COOKIE["pass"]))
    {
    setcookie("pass", "");
    }
  }

Here what is in the user.php

public function login_box() {
  $str = '';
  if (USE_LOGIN_SYSTEM) {
    global $words, $subdir;
    $str .= '<div itemprop="articleBody">
            <div class="bootstrapCSS">
			<div class="in-container service-container">
			<div class="bidders-container">
			<h2 style="text-align:center">Please Login</h2>
			<form action="' /*. Url::html_output($_SERVER['PHP_SELF']) .*/ . $_SERVER['REQUEST_URI'] /*'?dir='*/ . (isset($subdir) ? rawurlencode($subdir) : '') . '" method="post">
			<div class="col-md-6 col-md-offset-3">
			<div class="form-group">
			<label for="login_user" class="form-label">' . $words -> __get('username') . ':</label>
			<input type="text" name="username" class="form-control" placeholder="' . $words -> __get('username') . '" value="<?php if(isset($_COOKIE["user"])) {echo $_COOKIE["user"];} ?>"/>'. '
			</div>
			<div class="form-group">
			<label for="login_pass" class="form-label">' . $words -> __get('password') . ':</label>
			<input type="password" name="password" placeholder="****" class="form-control" value="<?php if(isset($_COOKIE["pass"])) {echo $_COOKIE["pass"];}?>"/>	
			<input type="checkbox" name="remember" <?php if(isset($_COOKIE["user"])) { ?> checked <?php }?> /> 
			<label for="remember-me">Remember Me</label>
			</div>
			<input type="submit" name="Submit" value="' . $words -> __get('login') . '" class="button2 btn btn-primary btn-flat">
			<div class="clearfix"></div>
			</div>
			</form>
			</div></div></div></div>'
			;
		}

		
		
		if (LEVEL_TO_UPLOAD === GUEST)
		{
			global $you;
			$upload_panel = new Upload($you);
			$str .= $upload_panel -> __toString();
		}
		return $str;
	}

thank you for your help and time.