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Doing my digging and it appears this is chapter 4. Code from the sample: <?php Require_once("e10dog.php"); $lab = new Dog; // ------------------------------Set Properties-------------------------- $dog_error_message = $lab->set_dog_name('Fred'); print $dog_error_message == TRUE ? 'Name update successful<br/>' : 'Name update not successful<br/>'; Note the lack of 'bool' before $dog_error_message. I'm not trying to be a jackass here, but when you're learning a language you have to read the tutorials completely, follow them accurately, and listen to the people who know what they're talking about when they try to help with any confusion.

But in the code you've posted, you don't have a class. You can type method/function parameters and class properties, but as far as I've found trying to type variables in the global namespace doesn't work even in 8.0. What book are you using?

Unless they provide a way to revoke an access token, the only thing you can do is make sure the user is logged out of your system - you simply can't log someone out of some other website (not unless you can find an security weakness in their site to do so). But a secure OAuth login prompt should not have the side effect of signing the user into that site in the first place... This isn't just an issue for your two sites: anyone on a shared computer needs to know that if they log into anything, be that Google or Facebook or Amazon, then they have to log out again before they leave. I don't know all the details of what's going on but it doesn't sound like there's anything you can do.