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 you 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 ...
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