The PHP chdir() function changes the current directory.

The PHP chroot() function changes the root directory of the current process to directory, and changes the current working directory to “/”.

The PHP closedir() function closes a directory handle.

The PHP dir() function returns an instance of the Directory class and is used to read a directory.

The PHP getcwd() function returns the current working directory.

The PHP opendir() function opens a directory handle.

The PHP readdir() function returns the name of the next entry in a directory.

The PHP rewinddir() function resets the directory handle created by opendir().

The PHP scandir() function returns an array of files and directories of the specified directory.