Why does the tutorial not actually do the same thing?

There's a very strange question,
First of all, the premise, generally upload pictures, form type to be written file
But the discovery of this CMS is used in the text,
Is it wrong to write, or I understand wrong, if I understand wrong, but the PHP tutorial so say, this is what is going on,
Found in things, in the actual programming, often do not follow the regular cards, and the tutorial is always talking about those things that are not used, I am, this is what is going on

Reply to discussion (solution)

This text type of input, is to receive the file upload after the save address
The actual upload form is not on this page

Analyze its filemain and the place where it forms to submit the form

You see the button on the right, it is the asynchronous upload image after successful, returned the image on the server address, and then follow the table single post
The principle and implementation of asynchronous upload pictures, beginners do not suggest touch, know how to go on OK

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