I just started learning PHP a few months ago, during that time I learnt that PHP can do almost anything! It's great.
It depends how you mean by 'update'. If you mean you want to be able to post text to a web page using a form. Then yeah PHP can do that.
First you need to decide where the form is going to post the text to.
Since you already said that you don't have a MySQL Database, you could store the text into an ASCII file.
So basically, the form posts the results to a PHP script, which then opens your ASCII file and saves the text inside it.
Then your web page would use some simple PHP code to then open the ASCII file and display it's contents on the web page.
I highly recommend this site for learning PHP
http://www.tizag.com/phpT/
you'll see it has tutorials for File Open, File Write, File Close
which are the PHP basics for storing data into text files.
Hope that helps! 
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