The simplest way to allow a web user to update a text file using PHP and Javascript?

Problem:

I don't know the simplest way to allow a single web viewer to update data in a text file on a server. (ie. only 1 person will be changing the data.)

Objective:

To make a prototype web application just one person needs to input in the start and end dates of new assignments and locations of staff and the whole company can visualize the information on a GANTT chart, probably using this Jquery libary.

Constraints:

My data is about the equivalent size of 1000 of these javascript list of lists like

 *data = [["John Smith" , "assigment" , "1/1/10", "1/1/11", "Peru"],[...],...]* 

Employee assignment data must be on an internal server.

I can't use a database (such as SQlite or MySQL).

I can only use PHP, Javascript, and jQuery.

Fact: Javascript cant directly change a data file sitting on the server.

My tentative fuzzy solution:

On client-side: use jQuery getJSON() to pass the data back and forth between dataReadWriter.php.

On server-side: dataReadWriter.php modifies a PHP array as well as writes modified data and reads JSONdata.txt stored in a text file on our i开发者_运维技巧nternal server.

Given the constraints, it can't be done a lot smarter than what you are suggesting. One thing though, you shouldn't overwrite the only file containing the data, at least switch back and forth between two files, and make sure that your program does not overwrite the other file if one of the files show any signs of being damaged. You can use a PHP session to keep track of which file is the most recent, but better have some in-file timestamps as a fallback.

Is there anything in particular that you worry about?