----- Original Message -----
From: "Alex Shi" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, July 21, 2004 1:39 AM
Subject: [PHP] Very weird issue....
> Hi all,
>
> Please take a look at following very simple script;
>
> #!/usr/bin/php -q
> <?
> echo "Hello, world!\n";
> if (!$tty) {
> $tty = fopen('php://stdin', 'r');
> }
> print "Hello: ";
> $ch = fgets($tty, 1024);
> print "$ch\n";
> ?>
>
> I tested it on many servers. Here is how it running (you can
> figure out yourself): Firstly it displays "Hello, world!", then
> displays "Hello: " at second line and waits for user input;
> You input a "yes" and it displays the "yes"; then end. So, on
> the screen you will see:
>
> Hello, world!
> Hello: yes
> yes
>
> However, on one of the servers, it doesn't run like above,
> but in a reversed way: Firstly, it displays nothing but waits
> for your input; you input a "yes", then it displays the "yes",
> then "Hello, world!", then "Hello: yes". So, on the screen it
> looks like this:
>
> yes
> Hello, world!
> Hello: yes
>
> Weird? To me IT IS! I really don't understand why all the
> echos/prints did not function until the script got data from
> tty, even they are before fgets..
>
> I found this issue during an unsuccessfull pear installation.
> The pear installer stopped and waited for my input without
> any prompt - there is prompt message but not displayed!
>
> Can anyone let me know how this can happen? Thanks
> in advance!
>
> Alex
>
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>
>
I remember this used to happen in c++ because of buffering; there you had to
tie STDIN and STDOUT in some cases: cin.tie ( &cout );
Input and output having strict order in program could follow each other not
the way you expected.
So I see it's caused by stream handling and buffering.
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