php cannot create folder

php cannot create the folder?

Upload, folder creation failed:

Check the function description in the official PHP documentation:

mode has been specified as: 0777. Why is it still reporting an error saying that it does not have permission? ?

After carefully reading the document, I found that this involves a recursive mode, and the directories that may be created exist in multi-level directories. The current directory to be created in the project: 20160704, it should be in the online/thum/img folder:

So, add the third parameter to the mkdir function to open Recursive mode:

Example: mkdir($uploadpath,0777,true);

Upload the image again, successful! !

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