Advance File managment?

[Aamit]

Hi,

I want to create simple file management program.

Suppose i have 10 users. and file xyz.txt

When 1st user access file he has authority to read and write.
but if at the same time 2nd user try to access this file.
i have to give only read access or put message like wait 1st users writing some operation.

How to create such program in PHP.

Please tell me which concept i want to use or any reference tutorial?

[diafol]

One way - put a block on it via database.

Here:

http://stackoverflow.com/questions/293601/php-and-concurrent-file-access

[chrishea]

Have a look at flock