??? ???? ????? page.class.php ??? ????.

?? ??? ??? ????.

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/3/5 0005
 * Time: 下午 5:08
 */
class Page{
    private $total;  //總記錄數(shù)
    private $pagesize;//每頁顯示的條數(shù)
    private $current; //當(dāng)前頁
    private $pagenum; //總的頁數(shù)
    public function __construct($total,$pagesize,$current)
    {
        $this->total=$total;
        $this->pagesize=$pagesize;
        $this->current=$current;
        $this->pagenum=ceil($this->total/$this->pagesize);
    }
    //獲取SQL中的limit條件
    public function  getLimit(){
        //計(jì)算limit條件
        $lim=($this->current-1)*$this->pagesize; //每頁顯示開始的記錄數(shù)
        return $lim.','.$this->pagesize;
    }
    //獲得url參數(shù),用于在生成分頁鏈接時(shí)保存原有的GET參數(shù)
    private function getUrlParams(){
        //去掉page參數(shù)并重新生成GET參數(shù)字符串
        $params=$_GET;
        unset($params['page']);
        return http_build_query($params);
    }
    //獲取分頁鏈接
    public function showPage(){
        //如果少于1頁則不顯示分頁導(dǎo)航
        if($this->pagenum<=1){
            return '';
        }
        //獲取原來的GET參數(shù)
        $url=$this->getUrlParams();
        //拼接URL參數(shù)
        $url=$url?"?$url&page=":"?page=";
        //拼接"首頁"
        $first='<a href="'.$url.'1">[首頁]</a>';
        //拼接上一頁
        $prev=($this->current==1)?'[上一頁]':'<a href="'.$url.($this->current-1).'">[上一頁]</a>';
        //拼接下一頁
        $next=($this->current==$this->pagenum)?'[下一頁]':'<a href="'.$url.($this->current+1).'">[下一頁]</a>';
        //拼接尾頁
        $last='<a href="'.$url.$this->pagenum.'">[尾頁]</a>';
        //組合最終樣式
        return "當(dāng)前為{$this->current}/{$this->pagenum} {$first} {$prev} {$next} {$last}";
    }
}

1, ???? ??? ?? ??? ???? ??? ???

private $ total; //? ??? ?(?????? ??? ?? ??)
private $pagesize; //? ???? ???? ?? ?(??? ?? ??)
private $current //?? ???(???) ? ? ?? ?????, ?? ???? ??? ??? 1? ?????. )
private $pagenum; //?? ??? ?(?? ??? ?/? ???? ???? ?? ?? ????? ??) ?? (? ??? ?-1/? ???? ???? ?? ?)+1)

2, ?? ???? ??? ????.