First extension. PHP functions

Author: Julien Pauli

Book/php7/extensions_design/extension_skeleton.rst

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+Extension skeleton
+==================
+
+Here we detail what a PHP extension look like, and how to generate a skeleton using some tools. That will allow us to 
+use a skeleton code and hack into it, instead of creating every needed piece by hand from scratch.
+
+We'll also detail how you could/should organize your extension files.