how to generate sound program for capctha in php

I am making API like recapctha.I am hanging to make coding for开发者_StackOverflow社区 sounde system for this API.

What is the concept behind to make this code? Id it possible to make this is javascript ?

Check out the PHP section on http://captchas.net/. It doesn't seem like the best but it does seem the best thing I can find on the web, otherwise you'll have to create it on your own.

You could have .wav files for every single letter and number, and append the - according to the captcha text - relevant files to each other and send it out to the browser as one big wav file.