Something

class AjaxTest extends AjaxCore
{
	function AjaxTest()
	{	
		$this->setup();
		parent::AjaxCore();
	}
	
	function setup()
	{
             // $_GET is not set
	}
		
	function getInfo()
	{
            // $_GET is set here
	}	
		
} 

new AjaxTest();