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I had some code and recently I moved over to a new server which happens to be running Debian 5.0 Lenny. I had some code involving page redirection that stopped working and I had to add ob_start(); to the top of the .php files in question to get them working again. I read some documentation for ob_start(); but I have to admit it did not make sense to me at all. Why am I unable to send my headers unless ob_start(); has been invoked first? Is there a stack someplace being created? If so is it a stack only for header information? What exactly is ob_start(); doing? Thank you!