The unlink function cannot find the file due to the thorny problem.

The unlink function cannot find the file! All php files, mysql, are UTF-8 encoded. the Source Code is $ _ POST [img] in the code is the image name, which is UTF-8 encoded, in windows, the image name is gbk encoded. why? what should I do? ------ solution: -------------------- do not use Chinese. Transcoding is required for Chinese characters. The unlink function cannot find the file!

All php files, mysql, are UTF-8 encoded. the Source Code is $ _ POST ['IMG '] in the code is the image name, which is UTF-8 encoded, in windows, the image name is gbk encoded. why? how can this problem be solved?
------ Solution ----------------------
Do not use Chinese.
Transcoding is required for Chinese characters.