thinkph How to tell if there is a picture upload?

thinkph How to tell if there is a picture upload?
Do change the Avatar function, there is image upload, picture path with the new path. No image upload, the picture path is still the original

Reply to discussion (solution)

Avatar are to write the path to the database, like Discuz is stored in a certain rules of the path, to find whether there is a user's avatar, Wood has the default, some call directory under; The general practice is to store the database, for the empty default, and some words directly call the path to display it.

1, can judge $_files array
2, call the upload method of the upload class, there will be returned information

Judge $_files.
You print it.
Print_r ($_files);
I know there is the difference between upload and no upload.

What's the relationship with thinkphp?
Direct $_files not right?

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