Core PHP Programming, Third Edition

9.1. Files

These functions manipulate or return information about files. Many of them are wrappers for the commands you execute in a UNIX or Windows command shell. When the functions in this section call for a filename or a directory, you may name a file in the same directory as the script itself. You may also use a full or relative path. The . and .. directories are valid in both UNIX and Windows. You may also specify drive letters on a Windows machine. Backslashes can delimit directories and filenames when running under Windows, but forward slashes are interpreted correctly, so stick with them.

boolean chdir(string directory)

When a PHP script begins to execute, its default path is the path to the script itself. That is, if the fully qualified ...