All examples I can find on the internet seem to show using the indexing operator for $_GET and $_POST.
For example, I would think you could write:
<?php
    echo $_GET->parameterName;
?>
instead of
<?php
    echo $_GET['parameterName'];
?>
I get this error when I try the first piece of code:
NOTICE Trying to get property of non-object on line number 2
 
     
    