Compresses the content of a directory into a ZIP file.
There is no result value.
The required dirpath is a path leading to the directory to be zipped. The required filepath is a path that determines the location and name of the output file (the ZIP file).
If you set overwrite="yes", any existing ZIP file with the same name will be silently overwritten. Otherwise, the operation is cancelled and an error message is returned saying that the file already exists.