PHP实现的分页类定义与用法示例

<?php
  class Page {
     private $total;   //总记录
     private $pagesize;  //每页显示多少条
     private $limit;     //limit
     private $page;      //当前页码
     private $pagenum;   //总页码
     private $url;      //地址
     private $bothnum;   //两边保持数字分页的量
   //构造方法初始化
   public function __construct($_total, $_pagesize) {
     $this->total = $_total ? $_total : 1;
     $this->pagesize = $_pagesize;
     $this->pagenum = ceil($this->total / $this->pagesize);
     $this->page = $this->setPage();
     $this->limit = "LIMIT ".($this->page-1)*$this->pagesize.",$this->pagesize";
     $this->url = $this->setUrl();
     $this->bothnum = 2;
   }
   //拦截器
   private function __get($_key) {
     return $this->$_key;
   }
   //获取当前页码
   private function setPage() {
     if (!empty($_GET['page'])) {
        if ($_GET['page'] > 0) {
          if ($_GET['page'] > $this->pagenum) {
             return $this->pagenum;
          } else {
             return $_GET['page'];
          }
        } else {
          return 1;
        }
     } else {
        return 1;
     }
   }
   //获取地址
   private function setUrl() {
     $_url = $_SERVER["REQUEST_URI"];
     $_par = parse_url($_url);
     if (isset($_par['query'])) {
        parse_str($_par['query'],$_query);
        unset($_query['page']);
        $_url = $_par['path'].'?'.http_build_query($_query);
     }
     return $_url;
   }   //数字目录
   private function pageList() {
     for ($i=$this->bothnum;$i>=1;$i--) {
      $_page = $this->page-$i;
      if ($_page < 1) continue;
        $_pagelist .= ' <a href="'.$this->url.'&page='.$_page.'" rel="external nofollow" rel="external nofollow" >'.$_page.'</a> ';
     }
     $_pagelist .= ' <span class="me">'.$this->page.'</span> ';
     for ($i=1;$i<=$this->bothnum;$i++) {
      $_page = $this->page+$i;
        if ($_page > $this->pagenum) break;
        $_pagelist .= ' <a href="'.$this->url.'&page='.$_page.'" rel="external nofollow" rel="external nofollow" >'.$_page.'</a> ';
     }
     return $_pagelist;
   }
   //首页
   private function first() {
     if ($this->page > $this->bothnum+1) {
        return ' <a href="'.$this->url.'" rel="external nofollow" >1</a> ...';
     }
   }
   //上一页
   private function prev() {
     if ($this->page == 1) {
        return '<span class="disabled">上一页</span>';
     }
     return ' <a href="'.$this->url.'&page='.($this->page-1).'" rel="external nofollow" >上一页</a> ';
   }
   //下一页
   private function next() {
     if ($this->page == $this->pagenum) {
        return '<span class="disabled">下一页</span>';
     }
     return ' <a href="'.$this->url.'&page='.($this->page+1).'" rel="external nofollow" >下一页</a> ';
   }
   //尾页
   private function last() {
     if ($this->pagenum - $this->page > $this->bothnum) {
        return ' ...<a href="'.$this->url.'&page='.$this->pagenum.'" rel="external nofollow" >'.$this->pagenum.'</a> ';
     }
   }
   //分页信息
   public function showpage() {
     $_page .= $this->first();
     $_page .= $this->pageList();
     $_page .= $this->last();
     $_page .= $this->prev();
     $_page .= $this->next();
     return $_page;
   }
 }
?>

<?php
  $_page = new Page($_total,$_pagesize);
  //其中 $_total 是数据集的总条数,$_pagesize 是每页显示的数量.
?>