Re: Re: (SOLVED) Varying session behavior between 2 nearly identical Apache/PHP setups

nice of you to write up the solution... Matthew North wrote: > Thanks to all who responded. Your responses reconfirmed that there > must be some configuration difference between the two so I grudgingly > re-examined everything, and esp. phpinfo() output. > > Turns out the test machine had a default (at build time) of > 'output_buffering = 0'. Although the two machines shared exact > php.ini, the test machine was effectively doing no output buffering > while the development system was. Explicitly changing this setting to > 4096 'solved' the problem. > > However, this wasn't the whole story. Turning on output buffering > could only solve the problem if we were doing some out-of-band output > before the session headers were sent that was now being buffered. > Sure enough I found some code that was outputting some response text > before session_start() was called. On the test machine this output > was being buffered until after session_start(), so no apparent problem > existed. > > I think the lesson here is, if you're missing headers in your output, > assume first that it's because you've started body output before the > headers in question were sent. If I'd made that assumption earlier I > probably would have saved hours on this bug! (otoh, doesn't that > situation normally result in a PHP warning? where'd that go? oh > well...). most likely ini setting display_errors is OFF - chances are the PHP errors/warnings/etc are being logged to the apache error log. > > - Matt >