When performance is important including server memory,I am curious if using output buffering like ob_start(); in PHP has ANY performance hits over not using it? Does it use more memory or anything to use it?
In my situation on a high traffic site where I need all the memory I can for memcache and APC and all the other server activities I am just curious if I should use it or not, the only real reason it comes in handy for me is for redirecting pages , sending headers I should say after a header has already been sent, my site has header , body, footer file setup so sometime I need to redirect depending on what is in the body file so if the header is already shown ion screen that creates a problem, using output buffering is 1 solution but there are other solutions so just curious about performance