RecursiveDirectoryIterator

<?php
$dir = '.';

foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir)) as $file){
    echo $file->getPath().DIRECTORY_SEPARATOR.$file->getFilename().'<br>';
}

function directory_recursive($dir){
    $name_dir = substr(strrchr($dir,DIRECTORY_SEPARATOR),1);
    if($name_dir == '.' || $name_dir == '..') return false;
    if($fp = opendir($dir)){
        while(($file = readdir($fp)) !== false){
            $file = $dir.DIRECTORY_SEPARATOR.$file;
            if(is_dir($file)){
                directory_recursive($file);
            }
            elseif($file != '.' && $file != '..'){
                echo '<div>'.$file.'</div>';
            }
        }
        closedir($fp);
    }
}
echo '<pre>
------------------------------------------------
------------------------------------------------
</pre>';
directory_recursive($dir);
?>