Hello
++$my_information means it can be Increments $my_information by one, then returns $my_information.
$my_information++ means it can be
Knowledge is power. Information is liberating. Education is the premise of progress, in every society, in every family.
Change products per page for individual categories inmagento
local.xml
file for this.app\design\frontend\<your_package>\<your_theme>\layout\local.xml