id = $id; $this->name = $name; $this->group = $group; } public function id() : string { return $this->id; } public function name() : string { return $this->name; } public function has_group() : bool { return \is_string($this->group); } public function group() : ?string { return $this->group; } // Fix deprecation warning in PHP 8 while still working in PHP 7 #[\ReturnTypeWillChange] public function jsonSerialize() { return [$this->id, $this->name, $this->group]; } public static function new(string $id, string $name, ?string $group = null) : self { return new self($id, $name, $group); } }