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I've been looking through CodeIgniter's code to get a better idea how a MVC might be programmed and I've stumble upon a piece of code I don't quite understand.

 

They have a Common.php file that gets included, and that file contains the function 'load_class'. Now in there libraries folder they have the class Controller. Now in this class they make use of the 'load_class' function.

 

I don't quite understand how this is possible, since the function isn't defined in the class itself. How is it possible that they can use the function inside the class itself.

 

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https://forums.phpfreaks.com/topic/86940-solved-scope-in-classes/
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