How to track change of added and deleted strings in a file using php?

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I have a trackchange package called `trackchange.sty` which will style the added or deleted text as in MS word. To use this package, `\add{text}` to add and `\remove{text}` to delete the string in the file and output will be in PDF format

For example:Track change pdf

So,my question is how to track the string which is added or deleted in a file. So that at the backend I could put `\add{}` or `\remove{}`tags wherever the strings are added or deleted , to create a PDF with trackchanges output.

If I have any logic to achieve this, only then I could try something to show here.But I don't have any logic to work out this, I just need some hint how to do this using PHP

Posted 9-Mar-15 20:50pm

Vidhya Raju

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Sergey Alexandrovich Kryukov 10-Mar-15 3:16am

I wоnder why?
—SA

Vidhya Raju 10-Mar-15 4:10am

I need some indication where the strings are added or deleted then I will replace that string with \add{string} as such so I will get output with track change.So how to capture the added or deleted string

Sergey Alexandrovich Kryukov 10-Mar-15 7:40am

And why doing all that?
—SA

Vidhya Raju 10-Mar-15 9:56am

I'm in the process of creating editor using PHP. Editor is for latex language. A latex is a language to create a PDF with desired template. Latex has a package called "trackchange.sty", which will give the output with trackchanged style in the pdf output. To use this package,have to let the package know wherever the strings are added or deleted by using the tags "\add{text}" or "\remove{text}". So, wherever that package finds these text it will style the text which has tags. Now in my editor, how can I capture the added or deleted text so that I could put these tags at the backend and output a PDF with track changes effect.

Sergey Alexandrovich Kryukov 10-Mar-15 10:50am

Sounds pretty interesting, thank for answering.
—SA

Vidhya Raju 11-Mar-15 1:32am

:) Any idea how to acheive this using PHP or Javascript? I think PHP should be suitable for this because file manipulation

Mohibur Rashid 10-Mar-15 22:28pm

You can do what git does. Take an new copy of the original file after the user press save.

Vidhya Raju 11-Mar-15 1:34am

I can compare old file with new file(with new changes), then I can get the differences between these two. But how to put tags on changed text. Can I know what git does?

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