Questions about the PHP development project design Documentation

Questions about the PHP development project design Documentation
Hello everyone! I am using PHP to make a Web site, but I do not know how to write PHP design documents, because there are no classes, all functions, and the project design of the Java EE is not the same, do not know how to write. Which shrimp guide little brother, greatly appreciated!!

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Then write an API, according to the spelling sequencer.
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Hello everyone! I am using PHP to make a Web site, but I do not know how to write PHP design documents, because there are no classes, all functions, and the project design of the Java EE is not the same, do not know how to write. Which shrimp guide little brother, greatly appreciated!!


Thanks to the answer, is all the functions are written in the document? But there's no such thing as a diagram.

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According to the process of simple writing, the process of how the function of the implementation of writing on the line. What it needs to be so focused.
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Does the function also have a call relationship?

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