if ( $handler != false ) {
    $i = 0;
    while ( $filename = readdir($handler) ) {
        if ( $filename != "." && $filename != ".." ) {
            if ( $i < $offset ) {
                $i++;
                continue;
            }
            $size = getimagesize("files/".$filename);
            //过滤掉非图片文件
            if ($fileType == "image" && empty($size)) {
                continue;
            }
            if ($fileType != "image" && !empty($size)) {
                continue;
            }
            $filesize = filesize("files/".$filename);
            array_push($files, array("thumbURL" => dirname($_SERVER['PHP_SELF'])."/files/".$filename, "oriURL" =>
                dirname($_SERVER['PHP_SELF'])."/files/".$filename,
                "filesize" => $filesize,
                "width" => intval($size[0]),
                "height" => intval($size[1])));
            $i++;
            if ( $i > $offset + 15 ) break;
        }
    }
    closedir($handler);
}