Encrypt::parseJwt() 

\nn\t3::Encrypt()->parseJwt($token = ''); 

Parse a JWT (Json Web Token) and check the signature. If the signature is valid (and therefore the payload has not been manipulated), the payload is returned. If the signature is invalid, FALSE is returned.

\nn\t3::Encrypt()->parseJwt('adhjdf.fsdfkjds.HKdfgfksfdsf');
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@param string $token
@return array|false

Source Code 

public function parseJwt( $token = '' ) {
	if (!$token) return false;
	if (substr($token, 0, 1) == '[') return false;
	$parts = explode('.', $token);
	if (count($parts) < 3) return false;
	$header = json_decode(base64_decode( array_shift($parts)), true);
	$payload = json_decode(base64_decode( array_shift($parts)), true);
	$signature = base64_decode(array_shift($parts));
	$checkSignature = $this->createJwtSignature($header, $payload);
	if ($signature !== $checkSignature) return false;
	$payload['token'] = $token;
	return $payload;
}
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