Would you like your PHP installation to “Talk” to you? Here’s a PECL package called FliteTTS which allows you to do just that. All you need to do is to send a text string and this extension converts that to spoken audio through RIFF or Raw wave file !

“FliteTTS is an extension built upon the Flite voice synthesis library. Flite was developed at Carnegie Mellon University and is a small, fast run-time voice synthesis engine which is designed to run in embedded systems and/or large scale server deployments (aka memory/processor efficient). The PHP extension uses the Flite library to transform text strings into spoken audio via both RIFF and raw formatted wave files. ”
Link: PECL :: Package :: FliteTTS