How to delete a folder and all contents using a bat file in windows?

I want to delete a folder with all files and subfolders using a bat file.

I have tried the following, but it is not working:

@DEL D:\PHP_Projects\testproject\Release\testfolder*.*

Can anybody help?

Solution

@RD /S /Q "D:\PHP_Projects\testproject\Release\testfolder"

Explanation:

Removes (deletes) a directory.

RMDIR [/S] [/Q] [drive:]path RD [/S] [/Q] [drive:]path

/S      Removes all directories and files in the specified directory
        in addition to the directory itself.  Used to remove a directory
        tree.

/Q      Quiet mode, do not ask if ok to remove a directory tree with /S