How to use getter & setter using dependency injection? - php-7.1

Question

I am trying to implement Dependency Injection in Symfony.
I created a class named Token as follows:
class Token
{
private $token;
private $key;
public function __construct(string $key)
{
$this->key = $key;
$this->settoken();
}
public function getToken(): string
{
return $this->token;
}
public function setToken(string $newString)
{
$token = $newString . '-' . $this->key;
return $this;
}
}
In the construct, I have a key which is defined in services.yml
Now I have injected this class into another controller like below.
$this->token->setToken('123456789');
dd($this->token->getToken())
But this is giving me 'Too few arguments to function setToken()' error. I think this is because in my Token class construct I have already passed key argument.
I am not sure how to properly use it.
Can anyone please help me.
Thank You.

Answer 1

I see the problem in the Token class. If you look at the __construct, you are calling to $this->settoken()
public function __construct(string $key)
{
$this->key = $key;
$this->settoken();
}
And below is the setToken method that has a string as a mandatory argument. That's why it gives you an error.
The class should look like this :
class Token {
private $token;
private $key;
public function __construct(string $key)
{
$this->key = $key;
}
public function getToken(): string
{
return $this->token;
}
public function setToken(string $newString): Token
{
$this->token = $newString . '-' . $this->key;
return $this;
}
}