Now that you've got a safe build environment and you're able to include
   the modules into PHP files, it's time to discuss how everything works.
  
Module Structure
    All PHP modules follow a common structure: 
    
- 
       Header file inclusions (to include all required macros, API
       definitions, etc.)
       
- 
       C declaration of exported functions (required to declare the Zend
  function block)
       
- Declaration of the Zend function block 
- Declaration of the Zend module block 
- Implementation of get_module() 
- Implementation of all exported functions