discuz图片处理缩略图显示的示例

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function thumblist($pid, $width = 0, $height = 0, $maximgcount = 3, $tid = 0){    global $_G;    if(!$pid) return array();    $width = intval($width);    $height = intval($height);    $maximgcount = intval($maximgcount);    $tid = intval($tid);    $maximgcount = $maximgcount <= 0 ? 3 : $maximgcount;    $maximgcount = min($maximgcount, 3);    $width = $width <= 0 ? 200 : $width;    $height = $height <= 0 ? 100 : $height;     if(!$tid) {        $tid = C::t('forum_post')->fetch_tid_by_pid($pid);    }     if(!$tid) return array();    $attachments = C::t('forum_attachment_n')->fetch_all_by_id('tid:'.$tid, 'pid', $pid, 'aid', true, false, false, $maximgcount);    $list = array();    $count = 0;    $nums = count($attachments);    if($nums ==1){        $width = 692;        $height =708;    } elseif ($nums == 2) {        $width = 660;        $height = 700;    } else if($nums ===3){        $width = 440;        $height = 532;    }    foreach($attachments as $aid=>$attachment) {        $bigimage = $_G['setting']['attachurl'].'forum/'.$attachment['attachment'];        $thumbfile = 'image/'.helper_attach::makethumbpath($attachment['aid'], $width, $height);        if(is_file($_G['setting']['attachdir'].$thumbfile)) {            $thumbfile = $_G['setting']['attachurl'].$thumbfile;        } else {            $thumbfile = '/'.getforumimg($attachment['aid'], 0, $width, $height,'fixwr');        }        if($attachment['width'] < $width) $thumbfile = $bigimage;        $list[] = array('thumb'=>$thumbfile, 'attachment'=>$bigimage, 'aid'=>$attachment['aid']);        $count++;        if($count >= $maximgcount) break;    }     return $list;}

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