This document discusses how to build a PHP extension in C, including preparing the development environment, generating extension skeleton files, implementing extension functions, compiling and testing the extension. It provides an example of creating a "hello world" extension and covers more advanced topics like adding parameters, returning values, memory allocation, and avoiding memory leaks when building PHP extensions in C. The document recommends resources for further information on PHP extension development.

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2. PHP Extension ?

14. Edit header file php_hello.h