PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Using Directory Functions
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If you are making directory browsing available via this mechanism, it is sensible to
limit the directories that can be browsed so that a user cannot browse directory listings
in areas not normally available to him.
An associated and sometimes useful function is rewinddir($dir), which resets the
reading of filenames to the beginning of the directory.
As an alternative to these functions, you can use the dir class provided by PHP. It has
the properties handle and path, and the methods read(), close(), and rewind(),
which perform identically to the nonclass alternatives.
In Listing 19.4 we rewrite the above example using the dir class.
Listing 19.4
browsedir2.php—Using the dir Class to Display the Directory Listing
Browse Directories
Browsing
The filenames in the above example aren’t sorted in any particular order, so if you
require a sorted list, you should use a function called scandir() that was introduced in
PHP 5.This function can be used to store the filenames in an array and sort them in
alphabetical order, either ascending or descending, as in Listing 19.5.