DirectoryIterator

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

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

Documentation

Related : Iterator, Standard PHP Library (SPL)