Can PHP's ob_start be called more then once?

Question

Can PHP's ob_start be called more then once?

Sorry if this is a dumb question but I really don't know.

My site is really large (file quantity), its a social network and one of the included files uses ob_start PHP's output buffer for something, i'm not ure someone else started my site a long time ago and now it is mine I need to look into it more to see what it's doing exactly.

Anyways I am wanting to use ob_start ("ob_gzhandler"); to compress CSS files and all files on my site get loaded (included) through the index file so I am wanting to know if I am able to use that even though it is already in use somewhere else in the code?

Answer 1

Yes, you can call it more than once. It creates a new buffer each time however, so be careful.

From the manual: "Output buffers are stackable, that is, you may call ob_start() while another ob_start() is active. Just make sure that you call ob_end_flush() the appropriate number of times. If multiple output callback functions are active, output is being filtered sequentially through each of them in nesting order."