有没有办法在不使用header（）的情况下重定向到php中的另一个页面？

Question

Is there a way to redirect to another page in php without using header()? I can't use header() because I am outputting some stuff first to the page. I've considered using Javascript's window.location but I'm using an if statement in php so is there any way in php to go to another page without using header()? Thanks in advance.