Checking login of external website
<p>Is it possible to check if a user is logged into a external website address? For example, check if the user is logged into a site like amazon.com and if the user is then direct them to a somewhat admin page locally that can only be accessed if the user has logged into that external website. </p>

<p>Basically using the login session of an external service, if it is possible what would be best method to do this in PHP? and is it a safe option?</p>

<p>Apologies is the question is not so clear guys. </p>
