php自定义分页类

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<?php class Paging {     private $totalStrip;  //总条数     private $pageStrip;   //每页条数     private $totalPages;  //总页数     private $url;         //当前页面的url     private $nowPage;     //当前的页码     private $aroundPage;  //当前页左右条数     public function __construct($totalStrip,$pageStrip,$aroundPage)     {         $this->totalStrip = $totalStrip;           //总条数         $this->pageStrip = $pageStrip??5;          //每页条数         $this->totalPages = $this->getTotalPages();//总页数         $this->url = $this->getUrl();              //当前页面的url         $this->nowPage = $this->getNowPage();      //当前的页码         $this->aroundPage = $aroundPage??2;        //当前页左右条数     }     //总页数     private function getTotalPages()     {         return ceil($this->totalStrip/$this->pageStrip);     }     //当前页面的url     private function getUrl()     {         return $_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];     }     //当前的页码     private function getNowPage()     {         return isset($_GET['page'])?$_GET['page']:1;     }     //首页     private function firstPage()     {         return "<a href='{$this->url}?page=1'>首页</a>";     }     //上一页     private function prevPage()     {         $prevPage = $this->nowPage - 1;         return "<a href='{$this->url}?page={$prevPage}'>上一页</a>";     }     //当前页之前     private function leftPage()     {         $str = '';         for($i=$this->aroundPage; $i >= 1; $i--){             $Page = $this->nowPage-$i;             if($Page > 0){                 $str .= "<a href='{$this->url}?page=$Page'>$Page</a>";             }           }         return $str;     }     //当前页     private function toNowPage()     {         return "<a>$this->nowPage</a>";     }     //当前页之后     private function rightPage()     {         $str = '';         for($i=1; $i <= $this->aroundPage; $i++){             $Page = $this->nowPage+$i;             if($Page < $this->totalPages) {                 $str .= "<a href='{$this->url}?page=$Page'>$Page</a>";             }         }         return $str;     }     //下一页     private function nextPage()     {         $nextPage = $this->nowPage + 1;         return "<a href='{$this->url}?page={$nextPage}'>下一页</a>";     }     //尾页     private function lastPage()     {         return "<a href='{$this->url}?page=$this->totalPages'>尾页</a>";     }     public function show()     {         $str = "";         if($this->nowPage > 1){             $str .= $this->firstPage();             $str .= $this->prevPage();             $str .= $this->leftPage();         }             $str .= $this->toNowPage();         if($this->nowPage < $this->totalPages){             $str .= $this->rightPage();             $str .= $this->nextPage();             $str .= $this->lastPage();         }           return $str;     } } //$a = new Paging(20,3,2); //echo $a->show();