Need some help please

Hi, I’m trying to create a totally automated site. There’s this one part that is giving me trouble. Here’s how the movie clip goes:

A person that is logged in clicks a button to go to the clip.
On the clip there is 1 button and a textfield.
The user inserts anything he wants into the textfield and clicks the button.
Next, the value is displayed in another movie clip for all to see and is saved and cannot be edited anymore.

That really stumped me. My idea of how it should work is this:

When the user clicks the button, flash calls a php function.
That make it so that whatever the user put in that textbox, it saves to a text file.
That text file is then displayed on a different movie clip.

However, I don’t know any php. I’ve searched many forums and sites, but it seems no one has a case like this. Also, the fscommands wouldn’t work since this is done all through a hosted site, not locally.

If anyone can please help me out, I’d be very grateful.