[SOLVED] How to restrict edit-access to a value, so only one person can edit at a time?

[Trolleri]

Hi

 

We are 46 people, who wants to help each other with writing one yearbook. Every person will get a page with text, which every person have had the change to fill out, add more or correct.

 

So I want to make a PHP-page, with a list of the 46 persons. When I click on a name, the PHP-page calls the text associated with the name, and also gives the user a form to edit that text in. To avoid any data-loss, when multiple people are editing the same entry, at the same time, I want to restrict the edit-access to one person at time.

 

Is it possible, and will someone help me to get startet?

[Ken2k7]

Lock the file when someone requests to write to it.

 

flock

[Maq]

Is this an actual file, or an entry in a database?

[Trolleri]

It really doesn't matter wether it is a text-file, or an entry in a database.

I was thinking of using Wordpress for it - you can see an example here: www.trolleri.dk/RH

 

But how can I lock the edit-possibility in Wordpress?

[Trolleri]

I went to wordpress supportforum, and they told me the following:

If you are editing a post on a wordpress blog, and another user wants to edit the same post, that second user gets a message saying that the post is already being edited - but the post is not at all locked!

 

I have finished a script that allows everyone to edit 46 textfiles, on my homepage.

index.php -> http://pastebin.com/m2bd58d4f

edit.php -> http://pastebin.com/m6bd366e3

example: http://trolleri.dk/he

The txt-files, as it might show from my code, is located ./pages/page001.txt etc.

 

After this, I have read the information about flock() - thanks Ken2k7

 

But something is going wrong, because the files are not getting locked. Can you help me?

 

[Trolleri]

I was able to solve it, without using flock().

I made a lock-file for each txt-file. Then the editing of the txt-file, is only allowed when lock-file is empty. After edit, the lock-file will be made empty.

 

Demo: http://trolleri.dk/HEHE/

 

index.php

http://pastebin.com/m53e7c92d

 

processscript.php

http://pastebin.com/m3efb5551

 

reset.php

http://pastebin.com/m32d469f2

 

And now to the final touch: Is it possible for me to unlock writing to the file, if the user neglects to press "cancel" or "update" when editing. If it is done now, the file is locked, and I need to use script reset.php

[Trolleri]

Nevermind!

 

If lockfile has been locked for more than one hour, the script resets lockfile, and goes back to editting the txt-file.

 

 

flock() could not be used for me.