php仿discuz分页效果代码

模板discuz的分页效果代码，效果图如下所示

/** 
* 显示样式2 
*/ 
function multi($mpurl,$page = 10) { 

$multipage = ''; 
$mpurl .= strpos($mpurl, '?') ? '&' : '?'; 
$realpages = 1; 
if($this->infocount > $this->items) { 
$offset = 2; 

$realpages = @ceil($this->infocount / $this->items); 
$pages = $this->maxpages && $this->maxpages < $realpages ? $this->maxpages : $realpages; 

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

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

$multipage .= ($this->pageno < $pages ? '<a href="'.$mpurl.'page='.($this->pageno + 1).'" class="p_redirect">>></a>' : ''). 
($to < $pages ? '<a href="'.$mpurl.'page='.$pages.'" class="last">... '.$realpages.'</a>' : ''). 
($pages > $page ? '<kbd><input type="text" name="custompage" size="3" onkeydown="if(event.keyCode==13) {window.location=\''.$mpurl.'page=\'+this.value; return false;}" /></kbd>' : ''); 

$multipage = $multipage ? '<div class="p_bar"><a class="p_total"> '.$this->infocount.' </a><a class="p_pages"> '.$this->pageno.'/'.$pages.' </a>'.$multipage.'</div>' : ''; 
} 
return $multipage; 
}