Nelmio\SecurityBundle\Signer::splitSignatureFromSignedValue PHP Method

    private function splitSignatureFromSignedValue($signedValue)
    {
        $pos = strrpos($signedValue, '.');
        if (false === $pos) {
            return array($signedValue, null);
        }
        return array(substr($signedValue, 0, $pos), substr($signedValue, $pos + 1));
    }