PHP and Broadvision

Hey there, I am a PHP developer but like to keep up with technology that is around - Our clients in general are tending to be bigger as the company gets bigger - Should we be looking at Broadvision and such products as opposed to PHP in the long term for larger projects- Does anyone have experience of these products and PHP and do they offer greater advantages such as better development time (although PHP is fast to write) or more stable or something? At the moment they seem kinda unnecessary and expensive - but we need to plan our strategy and technology ahead... Thamks, Abe