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.
Php zend.structure.headers Function syntax tag
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Php zend.structure.headers syntax tutorial
php tutorial guide and code design are for easy learning and programming. The code practice section provided at the top is for practising of this syntax. Use the code section up to practice your php programming online. Learning php is very easy, all you need is to use the examples on this site and practice them to perfect your skills.