PHP directory functions allows interaction with the system directories/folders. They are used to dealing with both folders and the folder’s content.

No installation is required for using the directory functions. They are part of the core language.

chdir()	Modify the current directory
chroot()	Modify the root directory
closedir()	Close a directory handle
dir()	Get an instance of the Directory class
getcwd()	Get the current working directory
opendir()	Open a directory handle
readdir()	Get an entry from a directory handle
rewinddir()	Reset a directory handle
scandir()	Get an array of files and directories of a specified directory