eZ\Publish\Core\REST\Common\Output\Generator\Json::startHashElement PHP Method

    public function startHashElement($name)
    {
        $this->checkStartHashElement($name);
        $this->isEmpty = false;
        $object = new Json\Object($this->json);
        if ($this->json instanceof Json\ArrayObject) {
            $this->json[] = $object;
            $this->json = $object;
        } else {
            $this->json->{$name} = $object;
            $this->json = $object;
        }
    }