class myBatch
{
	// commonly required method put into parent 
	// class referencing properties defined in child
	public function foo()
	{
		echo $this->foo;
	}
}

class myBatchA extends myBatch
{
	// properties specific to the extending class
	public $foo = 'bar';
}

class myBatchB extends myBatch
{
	// properties specific to the extending class
	public $foo = 'monkey';
}