I saw a link like this:
https://www.google.com/recaptcha/api/siteverify?secret=YOUR_SITE_KEY&response=".$captcha."&remoteip=".$_SERVER['REMOTE_ADDR']);
I know that it's setting the secret variable to YOUR_SITE_KEY and response to response=".$captcha."&remoteip=".$_SERVER['REMOTE_ADDR'] but, I'm not sure what those symbols means that is, the ? and & in the query string.
There isn't really anything there that is particular to PHP.
The ? indicates the start of the query string. Within the query string you have a set of key=value pairs, each separated by an &.
PHP will populate $_GET with this data. It is part of the URL standard and any server side language will have a parser that provides similar functionality.
This is also the default data format browsers generate when submitting a form.
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