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`change_password.php`

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<?php
    session_start();
    include('check_login.php');

    $file_in = "accounts/accounts.json";
    $accounts = json_decode(file_get_contents($file_in), true);

    if(isset($_POST['username']) and isset($_POST['password'])){
        foreach ($accounts['accounts'] as &$a){ #Loopar igenom accounts.json
            if($_POST['username'] == $a['user'] and sha1("LBM".$_POST['password']."Banking") == $a['password']){ #Ifall POST matchar med accounts.json
                $a['password'] = sha1("LBM".$_POST['newpassword']."Banking");
                $file = fopen($file_in, "w");
                fwrite($file, json_encode($accounts, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
                fclose($file);

                header('location: logout.php?action=password_change'); 
                exit();
            }
        }
    }
    header('location: password_form.php?mess=wrong');
    exit();
?>