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You're not saying that explicitly specifying the default value changes the behavior, are you? Maybe you meant to say that the default mode is "r"? > > sorry about that, i meant "ab" makes the code work. > > @Andrey Repin >> php -d 'display_errors=stderr' >> ? > > adding -d 'display_errors=stderr' does not make any difference. still > int(0) NULL Someone needs to debug this. Unfortunately, php currently has no Cygwin maintainer. Are you able to run php under gdb to see what's going on? Even better, are you interested in taking over as the php maintainer? If not, I might try debugging this at some point. But I have quite a bit of Real Life going on at the moment, so I don't know when I'll get to it. Ken