Re: Any conflict with $_POST when 2 users concurrently submitting the same form using POST method?

Thanks! Peter.
I’m very clear now.

"Peter Ford" <[email protected]> wrote in message 
news:[email protected]...
> Keith wrote:
>> Let's say user A and user B submitting purchase order form with
>> "order.php" at the same time, with method=post action='confirmation.php'.
>>
>> (1)   Will $_POST['order'] submitted by user A replaced by
>> $_POST['order'] submitted by user B, and the both user A & B getting the
>> same order, which is made by user B? Why?
>>
>> (2)    Since $_POST['xxx'] is superglobal array, will $_POST['order']
>> read by users other than A & B? In shared hosting server environment,
>> are all domains hosted within that server using the same $_POST array?
>> Can $_POST array accessible by all domains even if not from the
>> originating domain?
>>
>> Thx for clarification!
>>
>> Keith
>
> Other posters have explained, but I'm not sure their explanations are 
> clear.
> Think of it like this:
>
> User A posts to "confirmation.php". When the server receives the request, 
> it
> starts up a Process and fills the $_POST array with whatever came in, then 
> runs
> confirmation.php with that information.
>
> User B posts to "confirmation.php". When the server receives the request, 
> it
> starts up a Process and fills the $_POST array with whatever came in, then 
> runs
> confirmation.php with that information.
>
> The KEY thing is that the process in each case is entirely separate. Each 
> makes
> it's own copy of the script in its own bit of memory, and each has its own
> version of $_POST in its own bit of memory.
>
> The two posts can happen at the same time and they will still be 
> completely
> independent.
>
> The fact that $_POST is called "superglobal" does not mean that it is 
> shared by
> separate requests - it is not even shared by requests in the same session. 
> It
> just means that it is already declared and you don't need to use the 
> "global"
> keyword to access it in your PHP pages.
>
> -- 
> Peter Ford                              phone: 01580 893333
> Developer                               fax:   01580 893399
> Justcroft International Ltd., Staplehurst, Kent