DISCUZ 分页代码

<?php     
/*    
    [Discuz!] (C)2001-2006 Comsenz Inc.    
    This is NOT a freeware, use is subject to license terms    

    $RCSfile: global.func.php,v $    
    $Revision: 1.83.2.7 $    
    $Date: 2006/10/27 08:08:18 $    
*/    

function multi($num, $perpage, $curpage, $mpurl, $maxpages = 0) {     
    $multipage = '';     
    $mpurl .= strpos($mpurl, '?') ? '&' : '?';     
    if($num > $perpage) {     
        $page = 10;     
        $offset = 2;     

        $realpages = @ceil($num / $perpage);     
        $pages = $maxpages && $maxpages < $realpages ? $maxpages : $realpages;     

        if($page > $pages) {     
            $from = 1;     
            $to = $pages;     
        } else {     
            $from = $curpage - $offset;     
            $to = $from + $page - 1;     
            if($from < 1) {     
                $to = $curpage + 1 - $from;     
                $from = 1;     
                if($to - $from < $page) {     
                    $to = $page;     
                }     
            } elseif($to > $pages) {     
                $from = $pages - $page + 1;     
                $to = $pages;     
            }     
        }     

        $multipage = ($curpage - $offset > 1 && $pages > $page ? '<a class="p_redirect" href="'.$mpurl.'page=1">|?</a>' : '').     
            ($curpage > 1 ? '<a class="p_redirect" href="'.$mpurl.'page='.($curpage - 1).'">??</a>' : '');     
        for($i = $from; $i <= $to; $i++) {     
            $multipage .= $i == $curpage ? '<a class="p_curpage">'.$i.'</a>' :     
                '<a href="'.$mpurl.'page='.$i.'" class="p_num">'.$i.'</a>';     
        }     

        $multipage .= ($curpage < $pages ? '<a class="p_redirect" href="'.$mpurl.'page='.($curpage + 1).'">??</a>' : '').     
            ($to < $pages ? '<a class="p_redirect" href="'.$mpurl.'page='.$pages.'">?|</a>' : '').     
            ($curpage == $maxpages ? '<a class="p_redirect" href="misc.php?action=maxpages&pages='.$maxpages.'">??</a>' : '').     
            ($pages > $page ? '<a class="p_pages" style="padding: 0px"><input class="p_input" type="text" name="custompage" onKeyDown="if(event.keyCode==13) {window.location=\''.$mpurl.'page=\'+this.value; return false;}"></a>' : '');     

        $multipage = $multipage ? '<div class="p_bar"><a class="p_total"> '.$num.' </a><a class="p_pages"> '.$curpage.'/'.$realpages.' </a>'.$multipage.'</div>' : '';     
    }     
    return $multipage;     
}     
?>