Need One PHP Function Created

I have a system that produces content with the code below it takes the $content variable and puts it in a theme. echo functional($content); I want some one to create a function where content will be put into something like below $content = pageContent(); { content here } //then this below will put it on the theme echo functional($content); I attached my index file basically what i want is a cleaner way to set the $content variable then echo it with ( echo functional($content) ;)