Using $this when not in object context--i am using the latest version of php and mysql

Answer 1

You cant use $this in a static function. Use self:: instead

Answer 2

Make full_name non-static:

public function full_name() {}

You cannot access instance variables from a static method but that is exactly what you are trying to do.

If you use self instead of $this, you have to declare $first_name and $last_name static as well.

I don't even understand why you declare this method as static in the first place. It is an instance method by all means.

Answer 3

Check the last name of your index.php. echo->$object->full_name() is not valid. Use echo $object->full_name() instead.

Also, declare full_name() as non-static.