DirectoryIterator

The DirectoryIterator class provides a simple interface for viewing the contents of filesystem directories and files.

It is an iterator, and may be recursively traversed, like a file system.

<?php

    $iterator = new DirectoryIterator(__DIR__);
    while($iterator->valid()) {
        $file = $iterator->current();
        echo $iterator->key() . " => " . $file->getFilename() . "\n";
        $iterator->next();
    }

?>

Documentation

Related : Iterator, Recursion, RecursiveIterator, RecursiveTreeIterator, Standard PHP Library (SPL), FileSystemIterator, RecursiveDirectoryIterator, SplFileInfo