//related to the blog post at: http://www.eatmybusiness.com/food/2009/04/14/can-an-interface-class-extend-another-interface-class-in-php/104/

interface testinterfaceA
	{
	public function method1($arg);
	}

interface testinterfaceB extends testinterfaceA
	{
	public function method2($arg);
	}

class concrete implements testinterfaceB
	{
	public function method1($arg)
		{
		//do something
		}

	public function method2($arg)
		{
		//do something
		}
	}