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Joining .WAVs with PHP

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Join WAVs into one file.

I'm currently working on a CAPTCHA plugin for DokuWiki and thought about providing audio output for users not able to see the image. This is pretty simple for CAPTCHAs – there is no need for complicated speech synthesis because you only need recordings of the 26 possible letters. But you need a way of joining those recordings on the fly…

I looked around the web for a way to concatenate multiple wave files with PHP and found an article by Phillip Perkins called Create an audio stitching tool in PHP. But at a closer look his example code was overly complicated for my simple task.

Joining .WAVs with PHP