Zend framework controller filenames containing "init"?

Zend framework: what is the significance of controller filenames that have "init" in them? I have 3 files that se开发者_运维知识库ems to have exactly the same code, named:

TestController_init.php TestController.init.php TestController.php

?

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In my opinion you should have onlu one TestController.php that contains all behaviours that this controller should have (init() method, etc).

Could you pase the content of 2 other files ?