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Introduction - Zend_Amf
Zend_Amf provides support for Adobe's » Action Message Format (AMF), to allow communication between Adobe's » Flash Player and PHP. Specifically, it provides a gateway server implementation for handling requests sent from the Flash Player to the server and mapping these requests to object and class methods and arbitrary callbacks.
The » AMF3 specification is freely available, and serves as a reference for what types of messages may be sent between the Flash Player and server.