manage_user.php

<?php
include('config.php');
logincheck();
use Carbon\Carbon;
$message = [];
$title = "Create user";
$user = new User;
$categories = Category::all();

if(isset($_GET['id'])) {
    $title = "Edit user";
    $user = User::find($_GET['id']);
}

if (isset($_POST['submit'])) {

    $user->username = $_POST['username'];
    $user->password = $_POST['password'];
    $user->exp_date = $_POST['expdate'];

    if($_POST['expdate']) {
        $user->exp_date = Carbon::parse($_POST['expdate']);
    }


    $user->active = 0;
    if(isset($_POST['active'])) {
        $user->active = 1;
    }

    if (empty($_POST['username'])) {
        $message['type'] = "error";
        $message['message'] = "username field is empty";
    }
    else if (empty($_POST['password'])) {
        $message['type'] = "error";
        $message['message'] = "password is empty";
    }
    else if (empty($_POST['category'])) {
        $message['type'] = "error";
        $message['message'] = "Select one category";

    } else {
        if(isset($_GET['id'])) {
            $message['type'] = "success";
            $message['message'] = "User saved";
            $user->save();
            $user->categories()->sync($_POST['category']);
        } else {
            $exists = User::where('username', '=', $_POST['username'])->get();

            if(count($exists) > 0) {
                $message['type'] = "error";
                $message['message'] = "Username already in use";
            } else {
                $message['type'] = "success";
                $message['message'] = "User created";
                $user->save();
                $user->categories()->sync($_POST['category']);
                redirect("manage_user.php?id=" . $user->id, 2000);
            }
        }
    }

}

echo $template->view()
    ->make('manage_user')
        ->with('user',  $user)
        ->with('categories',  $categories)
        ->with('message', $message)
        ->with('title', $title)
    ->render();