PHP分页类收集

类似百度分页

   <?php
    /**
    *
    * 此分页函数,是从我一个项目上拿下来改写的,原先只是一个函数,现写成一个类,贡献给大家
    * 效果是百度分页那样的,不涉及数据库操作,
    * 实际上,分页的确是和数据库操作分开的
    * 使用方法
    * $total = 50;
    * $page = new Page($total);
    * echo $page->show();
   */
  
   class Page {
    
       public $total;        //总页数,在这里,你需要把总页数算出来
       public $p;         //当前页数
       public $start;     //排序起始页
       public $end;       //排序终止页
    
       public $url;      //当前的url,例如 index.php?p=
       public $display;  //左边显示的页数,例如是5,就是说左边有5页,总共是10页
    
       public function __construct($total, $url = '?p=', $display = '5') {
           $this->total = $total;
           $this->url = $url;
           $this->display = $display;
    
           $this->init();
           $this->order();
       }
      
       /**
        *初始化,包括简单的安全处理,当然,你可以扩展这个函数以达到你的要求
        */
       public function init() {
           //获取当前的页数
           $this->p = ($_GET['p'] + 0 <= 0)? 1: ($_GET['p'] + 0);
           if (!is_int($this->p)) {
               $this->p = 1;
           }
           //如果有人在页面上输入一个较大的数,我是这样处理的,显示最后一页
           //你可以自己扩展为"当前没有你找到的页",把下面的去掉,在show函数里加个判断就行了
           if ($this->p >= $this->total) {
               $this->p = $this->total;
           }
       }   
    
       /**
        *这里将是怎么显示为百度分页的那种效果,当然,已经够用了
        *还有局部没有处理好,如果处理好麻烦告诉我
        */
        public function order() {
           if ($this->total <= 2 * $this->display) {
               $this->start = 1;
               $this->end = $this->total;
           } else {
               if ($this->p <= $this->display) {
                   $this->start = 1;
                   $this->end = 2 * $this->display;
               } else {
                   if ($this->p > $this->display && ($this->total - $this->p >= $this->display - 1)) {
                       $this->start = $this->p - $this->display;
                       $this->end = $this->p + $this->display - 1;
                   } else {
                       $this->start = $this->total - 2 * $this->display + 1;
                       $this->end = $this->total;
                   }
               }
           }
       }
    
       public function show($style='1') {
           //如果没有数据,当然也就没有分页了
           if ($this->total <= 0) {
               return false;
           }
          
          $re = '';
           // $pre前一页 $next 后一页
		   if ($style=='2') {
   		        $re .= "<a href=\"{$this->url}1\">首页</a>";
           }           
           $pre = ($this->p - 1 <= 0) ? 1 : ($this->p - 1);
           $re .= "<a href=\"{$this->url}$pre\"><img src="/images/news/cn/botton_prve.gif" /></a>";
           //如果当前页是第一页,不要首页和前一页
           if ($this->p == 1) {
               $re = '';
           }
    
           for ($i = $this->start; $i <= $this->end; $i++) {
               $re .= ($i == $this->p)? "$i ": "<a href=\"{$this->url}$i\">$i </a>";
           }
          
           $next = ($this->p + 1 >= $this->total) ? $this->total : ($this->p + 1);
           //当前页是最后一页的页数,不要下一页和最后一页
           if ($this->p != $this->total) {
               $re .= "<a href=\"{$this->url}$next\"><img src="/images/news/cn/botton_next.gif" /></a>";
               if ($style=='2') {
               	 $re .= "<a href=\"{$this->url}$this->total\">最后一页</a>";
               }
           }           
          return $re;
      }
  }
?>