编辑：在opendir上构建：

$dir = "/etc/PHP5/";

// Open a known directory,and proceed to read its contents
if (is_dir($dir)) {
    if ($dh = opendir($dir)) {
        $images = array();

        while (($file = readdir($dh)) !== false) {
            if (!is_dir($dir.$file)) {
                $images[] = $file;
            }
        }

        closedir($dh);

        print_r($images);
    }
}