Why is the system user not being created?

Question

linux

Hello! Prompt, why the system user can not be created?
Here is the function

protected function create(array $data)
    {
//создаем пользователя в базе данных
        $user= User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
            'role'=>'customer',
        ]);

//получаем его ID
        $id = $user->id;
        $pass = $data['password'];
//создаем пользователя в Linux
        shell_exec("useradd -d /home/u$id/ u$id");
        shell_exec("echo u$id:$pass | chpasswd");
//возвратить экземпляр класса User
      return $user;
    }

The problem is that for some reason the user of the Linux system is not created. For the user who runs the web application in /etc/sudoers wrote:
user ALL=(ALL) NOPASSWD:ALL
(unfortunately I don’t know how to give access only to individual commands).

Answer 1

shell_exec returns the output of the running command as the result of the function.
To begin with, do var_dump(shell_exec())and see what's the matter, what the team swears at (if it swears).
In general, I would recommend exec()checking the status code of the result of the command, because the second command does not need to be executed if the first one fails with an error.