遍历一个文件夹下的所有文件和子文件夹

function listDir($dir = ‘.‘){
    if ($handle = opendir($dir)) {
        while (false !== ($file = readdir($handle))) {
            if($file == ‘.‘ || $file == ‘..‘){
                continue;
            }
            if(is_dir($sub_dir = realpath($dir.‘/‘.$file))){
                echo ‘FILE in PATH:‘.$dir.‘:‘.$file.‘<br>‘;
                listDir($sub_dir);
            }else{
                echo ‘FILE:‘.$file.‘<br>‘;
            }
        }
        closedir($handle);
    }
}