sandwich.tar.gz
    lettuce
    mayonaise
    cheese
    bread (directory)
        wholemeal

<?php $archive = new PharData('/upload/directory/sandwich.tar.gz');
foreach($archive as $file) {
        echo $file . "<br />";
}

<?php
    $archive = new PharData('/upload/directory/sandwich.tar.gz');
    foreach($archive as $file) {
        echo $file;
        if($file->isDir()) {
            echo ':';
            $dir = new PharData($file->getPathname());
            foreach($dir as $child) {
                echo "<br />$child";
            }
        }
        echo "<br />";
    }
?>

$archive = new PharData('/upload/directory/sandwich.tar.gz');

foreach (new RecursiveIteratorIterator($archive) as $file) {
    echo $file . "<br />";
}