PHP之分页类

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2016/6/22
 * Time: 21:37
 */

Class Page{
    protected $sum;  //总记录数
    protected $page_show; //每页显示多少记录
    protected $totalpage; //总页数
    protected $page; //当前页面
    protected $limit;
    protected $url;
    protected $start; //开始
    protected $end; //结束

    function __construct($sum,$row=1)
    {
        $this->sum=$sum;  //总记录数
        $this->page_show=$row;  //每页显示
        $this->totalpage=ceil($this->sum/$this->page_show);//总页数
        $this->url=$this->curUrl();  //地支
        $this->page=$this->curPage();  //当前页

        $this->start=($this->page-1)*$this->page_show;  //起始页

    }
    //获取当前页
    //min($this->totalpage,max((int)@$_GET['page'],1));
    public function curPage()
    {
        if(!empty($_GET['page']))
        {
            if($_GET['page']>$this->totalpage)
            {
                $page=$this->totalpage;
            }else{
                $page=$_GET['page'];
            }
        }else{
            $page=1;
        }
            return $page;

    }

    //获取当前地址
    public function curUrl(){
//        $_url=$_SERVER['REUQEST_URI'];  //当前的Url
//        $_par=parse_url($_url);  //分解当前URL
//        if(isset($_par['query']))
//        {
//
//        }

        $curUrl=isset($_SERVER['REQUEST_URI'])?$_SERVER['REQUEST_URI']:$_SERVER['PHP_SELF'].$_SERVER['QUERY_STRING'];
        //解析字符串
        $parseURL=parse_url($curUrl);  //分解获取查询字符串
        if(isset($parseURL['query']))
        {
            parse_str($parseURL['query'],$arr);  //将字符串解析成变量,并放去数组中
            unset($arr['page']);
            //$curUrl=$parseURL['path']."?".http_build_query($arr);
            $curUrl = $parseURL['path']."?".http_build_query($arr)."&page=";
            //var_dump($curUrl);
        }else{
           $curUrl=strstr($curUrl,"?")?$curUrl."page=":$curUrl."?page=";
        }
        return $curUrl;
    }

    //分页查询记录数
    public  function limit()
    {
        return "LIMIT {$this->start},{$this->page_show}";
    }

    //上一页
    public function pre()
    {
        return $this->page>1?"<a href='".$this->url.($this->page-1)."'>上一页</a>":'1';
    }

    //下一页
    public function next(){
        return $this->page<$this->totalpage?"<a href='".$this->url.($this->page+1)."'>下一页</a>":'';
    }

    //首页
    public function index()
    {
        return $this->page>1?"<a href='{$this->url}1'>首页</a>":'1';
    }

    //未接
    public function end()
    {
        return $this->page<$this->totalpage?"<a href='{$this->url}{$this->totalpage}'>未页</a>":'';
    }
    //总页数
    public function count()
    {
        return "<span>总页{$this->totalpage}  总计{$this->sum}条</span>";
    }

    //页码数组
    public function pagearray()
    {
        $pagelist=array();
        for($i=1;$i<$this->totalpage;$i++)
        {
            if($i==$this->page){
                $pagelist[$i]['url']="";
                $pagelist[$i]['str']=$i;
                continue;
            }
            $pagelist[$i]['url']=$this->url.$i;
            $pagelist[$i]['str']=$i;
        }
        return $pagelist;

    }

    //下拉列表

    public function select()
    {
        $arr=$this->pagearray();
        $str="<select class='s' onchange='javascript:location.href=this.options[selectedIndex].value'>";
        foreach($arr as $v)
        {
            $str.=empty($v['url'])?"<option value='{$this->url}{$v['str']}' selected='selected'>{$v['str']}</option>":"<option value='{$v['url']}'>{$v['str']}</option>";
        }
        $str.="</select>";
        return $str;
    }

}

$p=new Page(20);
echo $p->index();
echo "</br>";
//echo $p->curUrl();
echo "</br>";
echo $p->end();
echo $p->count();
echo $p->select();