这个代码是什么意思

<!--{if $_G['setting']['thumbstatus'] && $attach['thumb']}-->
                                                        <a href="javascript:;"><img id="aimg_$attach[aid]" src="{STATICURL}image/common/none.gif" zoomfile="{if $attach[refcheck]}forum.php?mod=attachment{$is_archive}&aid=$aidencode&noupdate=yes&nothumb=yes{else}{$attach[url]}$attach[attachment]{/if}" file="{if $attach[refcheck]}forum.php?mod=attachment{$is_archive}&aid=$aidencode{else}{$attach[url]}$attachthumb{/if}" alt="$attach[imgalt]" title="$attach[imgalt]

感觉像处理缩略图或者附件的东东...