Jose\Object\JWS::toJSON PHP Method

    public function toJSON()
    {
        Assertion::greaterThan($this->countSignatures(), 0, 'No signature.');
        $data = [];
        $this->checkPayloadEncoding();
        if (false === $this->isPayloadDetached()) {
            $data['payload'] = $this->getEncodedPayload($this->getSignature(0));
        }
        $data['signatures'] = [];
        foreach ($this->getSignatures() as $signature) {
            $tmp = ['signature' => Base64Url::encode($signature->getSignature())];
            $values = ['protected' => $signature->getEncodedProtectedHeaders(), 'header' => $signature->getHeaders()];
            foreach ($values as $key => $value) {
                if (!empty($value)) {
                    $tmp[$key] = $value;
                }
            }
            $data['signatures'][] = $tmp;
        }
        return json_encode($data);
    }