This code return program directory.

Deletes all files of a certain extention from a folder.

Make a new directory

Check the attributes of a file or folde

this function returns the aggregated size
of all files in a directory and its subdirectories

Checks to see if a file or folder exists
The fFile variable determines whether you're
looking for a File (True) or Folder(False)
The strName variable holds the fully qualified
path you're looking For

Get the Size of a Folde

Implementation of file_put_contents for PHP4