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Re: file access permission? [message #170080 is a reply to message #170074]

Fri, 08 October 2010 21:31

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 10/7/2010 2:50 PM, Amit Prakash Pawar wrote:
> I want to create simple file 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?

Check out http://us3.php.net/manual/en/function.flock.php.

But please note - this is ADVISORY LOCKING only - which means it only
works if you consistently use flock() before every request. And even
then it isn't real clean, because you need to open the file before you
can lock it.

However, if you look in the user notes, you can see examples of using
another file for locking, then access the file. Still not real clean,
but more workable.

But the real question here is - why are you attempting to do it this
way? It's the hardest way to get right, and very prone to errors. A
database would be a much better solution; it's made to lock data. And
if your data is something like a list, you don't even have to lock the
entire file - just the item you are changing.

A version control system, as Micah pointed out, would also be a good
solution, and maybe better if the file is more of a text document than a
list. But it would be a bit harder to implement than a simple database.

--
==================
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		file access permission? By: Amit Prakash Pawar on Thu, 07 October 2010 18:50
		Re: file access permission? By: Michael Fesser on Fri, 08 October 2010 19:28
		Re: file access permission? By: The Natural Philosoph on Fri, 08 October 2010 20:44
		Re: file access permission? By: Captain Paralytic on Fri, 08 October 2010 21:37
		Re: file access permission? By: The Natural Philosoph on Fri, 08 October 2010 22:34
		Re: file access permission? By: Jerry Stuckle on Fri, 08 October 2010 21:31
		Re: file access permission? By: Peter H. Coffin on Sat, 09 October 2010 03:25
		Re: file access permission? By: jussist(at)gmail(dot)com on Sat, 09 October 2010 09:53

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