WordPress unzip_file（）导致mkdir_failed（权限）

I am creating a WordPress framework that has an auto update facility. When the system updates the framework, it downloads a .zip file (works ok, stored in a temp folder), and afterwards tries to extract that zip file to a place within the theme. When unzipping, it throws an error complaining about not being able to create a directory ("mkdir_failed").I am creating a WordPress framework that has an