我们可以使用RecursiveDirectoryIterator 和 RecursiveIteratorIterator删除目录和子目录及文件，子目录将先与父目录删除

<?php
function cleanup_directory($dir) {
    $iter = new RecursiveDirectoryIterator($dir);
    foreach (new RecursiveIteratorIterator($iter, RecursiveIteratorIterator::CHILD_FIRST)
  as $f) {
        if ($f->isDir()) {
            rmdir($f->getPathname());
        } else {
            unlink($f->getPathname());
        }
    }
    rmdir($dir);
}
  
cleanup_directory('c:\\wamp\\junk');
?>