id = $id; } public function getId(): ?string { return $this->id; } /** * @param mixed[] $json */ public static function createFromArray(array $json): self { Assertion::keyExists($json, 'name', 'Invalid input. "name" is missing.'); return new self( $json['name'], $json['id'] ?? null, $json['icon'] ?? null ); } /** * @return mixed[] */ public function jsonSerialize(): array { $json = parent::jsonSerialize(); if (null !== $this->id) { $json['id'] = $this->id; } return $json; } }