Separating UI & Business logic in PHP code

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PHP

Hi,

I'm coding a PHP project. The project, by its very nature, is expected to run for a long time & thereby will go through a series of major & minor modifications. Like MVC architecture, I want to disintegrate UI elements & business logic separate in the project so that the maintenance becomes easier. At the same time, I don't want to follow object oriented approach. Can anybody guide me how to achieve this separation of UI & logic in a non object oriented environment?

Thanks in advance.