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# Header File Inclusions

The only header file you really have to include for your modules is `php.h`, located in the PHP directory. This file makes all macros and API definitions required to build new modules available to your code.

Tip: It's good practice to create a separate header file for your module that contains module-specific definitions. This header file should contain all the forward definitions for exported functions and include `php.h`. If you created your module using `ext_skel` you already have such a header file prepared.

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