Syntax error?

[rossaddison]

Hi, Perhaps this is a stupid question needing a curt reply, but I am getting a syntax error ... from the colon.... before the MessageInstance from Netbeans:

public function sms(string $to, string $text, array $options = []) : MessageInstance

I must be missing something really obvious here? Can you provide me please with some advanced knowledge on how to read this syntax.

Also there are two question marks after the ['from']. Educate me please!

{

# ### $from = $options['from']?? null;