Displaying directories stored within a directory - php

Question

I've just watched these videos on displaying images from a directory and would like some help modifiying the code.
http://www.youtube.com/watch?v=dHq1MNnhSzU - part 1
http://www.youtube.com/watch?v=aL-tOG8zGcQ -part 2
What the videos show is almost exactly what I wanted, but the system I have in mind is for photo galleries.
I plan on having a folder called galleries, which will contain other folders, one each for each different photo sets ie
Galleries
Album 1
Album 2
I would like some help to modify the code so that it can identify and display only the directories on one page. That way I can convert those directories into links that take you to the albums themselves, and use the orignal code to pull the images in from there.
For those that want the video code, here it is
$dir = 'galleries';
$file_display = array('bmp', 'gif', 'jpg', 'jpeg', 'png');
if (file_exists($dir) == false) {
echo 'Directory \'', $dir , '\' not found!';
} else {
$dir_contents = scandir($dir);
foreach ($dir_contents as $file) {
$file_type = strtolower(end(explode('.', $file)));
if ($file !== '.' && $file !== '..' && in_array($file_type, $file_display) == true) {
echo '<img src="', $dir, '/', $file, '" alt="', $file, '" />';
}
}
}

Answer 1

You need to use a function like this to list all of the directories:
function getDirectory( $path = '.', $level = 0 ){
$ignore = array( 'cgi-bin', '.', '..' );
// Directories to ignore when listing output. Many hosts
// will deny PHP access to the cgi-bin.
$dh = #opendir( $path );
// Open the directory to the handle $dh
while( false !== ( $file = readdir( $dh ) ) ){
// Loop through the directory
if( !in_array( $file, $ignore ) ){
// Check that this file is not to be ignored
$spaces = str_repeat( ' ', ( $level * 4 ) );
// Just to add spacing to the list, to better
// show the directory tree.
if( is_dir( "$path/$file" ) ){
// Its a directory, so we need to keep reading down...
echo "<strong>$spaces $file</strong><br />";
getDirectory( "$path/$file", ($level+1) );
// Re-call this same function but on a new directory.
// this is what makes function recursive.
} else {
echo "$spaces $file<br />";
// Just print out the filename
}
}
}
closedir( $dh );
// Close the directory handle
}
Then, pass the directory a user selected in as your $dir variable to the function you currently have.

Answer 2

I can't test any code right now but would love to see a solution here along the lines of:
$directory = new RecursiveDirectoryIterator('path/galleries');
$iterator = new RecursiveIteratorIterator($directory);
$regex = new RegexIterator($iterator, '/^.+\.(bmp|gif|jpg|jpeg|png)$/i', RecursiveRegexIterator::GET_MATCH);
SPL is powerful and should be used more.
The RecursiveDirectoryIterator provides an interface for iterating recursively over filesystem directories.
http://www.php.net/manual/en/class.recursivedirectoryiterator.php