PHP really has no standard. If you use any framework (for example, CakePHP, Zend Framework, etc.), it can impose a specific standard on you.
If you are not using a third-party library that forces the structure, just use common sense. (Put the images in the image directory, the included files in the include directory, etc.) The people who download and install the PHP applications will already be used for each application that performs different actions. The fact that you come up with it puts most of the competition in front of you :)
speshak
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