Document Management System with PHP

Need to implement a PHP solution, a simplified version of Document Management System with PHP.

1. locking the file on Linux system when user check out some documents to prevent other users from editing or override.

2. schedule a crontab job through PHP such that it can schedule to update massive pull the modifed to the original location and ulock those files.

Is there any sample example or similar coding for me to reference ... ? Is it feasible to do this with PHP.

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Ray PaseurCommented:
It is not feasible to do write your own DMS with PHP (too much work to reinvent this wheel), and it has been done by others.  Make a Google search like this and you can find some potentially useful DMS:

There are other good alternatives that may be susceptible to meeting your needs.

Dropbox provides a good tool for file sharing
GitHub is used by professional programmers to share files.  Git version control ensures that the contents remain safe, even when more than one person is using the same file.
Atlassian offers "Bitbucket" which is kind of similar to GitHub.

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