[Solved] Setting up a log-in for a website using PHP [closed]

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in a nutshell:
login.php

<?php
session_start();
function hhb_tohtml($str)
{
    return htmlentities($str, ENT_QUOTES | ENT_HTML401 | ENT_SUBSTITUTE | ENT_DISALLOWED, 'UTF-8', true);
}

$accounts=array(
//username =>password
'smith'=>'smell',
'admin'=>'password',
'guest'=>'guestpass'
);

if(array_key_exists('submit',$_POST)){
    if(!array_key_exists('username',$_POST)){
        $username="";
    } else 
    {
    $username=$_POST['username'];
    }
    if(!array_key_exists('password',$_POST)){
        $password='';
    }else {
        $password=$_POST['password'];
    }
    if(!array_key_exists($username,$accounts)){
        die('This username does not exist.');
    }
    if($accounts[$username]!==$password){
        die('wrong password!');
    }
    $_SESSION['logged_in']=true;
    $_SESSION['username']=$username;
    die('you have logged in as: '.hhb_tohtml($username));
}
?>
<!DOCTYPE html>
<html>
<head><title></title></head>
<body>
<form action="?" method="post">
  Username: <input type="text" name="username" /><br>
  Password: <input type="password" name="password" /><br>
  <input type="submit" name="submit" value="Submit" />
</form>
</body>
</html>

and in other places, like controlpanel.php:

session_start();
if(!isset($_SESSION['logged_in'])){die('you need to login first!');}

the session id will be stored in a cookie, thanks to session_start(), and the server will remember whether or not this session id is logged in.

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solved Setting up a log-in for a website using PHP [closed]