要实现附件信息功能，要增加下面三个hook文件。

1. attach_output_before.php

attach_downloads($aid);

2. model_attach_start.php

// downloads + 1function attach_downloads($aid, $n = 1) {
global $conf;
$sqladd = strpos($conf['db']['type'], 'mysql') === FALSE ? '' : ' LOW_PRIORITY';
$r = db_exec("UPDATE$sqladd `bbs_attach` SET downloads=downloads+$n WHERE aid='$aid'");
return $r; }

3. model_post_file_list_html_delete_before.php

$s .= '<br><div style="color:#999;"> 上传时间：'.date('Y-m-d', $attach['create_date'])."\r\n";
$s .= ' | 下载次数：'.intval($attach['downloads'])."\r\n";
$s .= '次 | 文件大小：'.humansize($attach['filesize'])."\r\n";
$s .= '</div>'."\r\n";