php 分页类（未实战）

Posted 2020-08-03

<?php 

/**
* 
*/
class Page
{
    private $_总页码;        //总页码
    private $_总条数;        //总条数
    private $_每页显示条数;    //每页显示条数        
    private $_当前页码;        //当前页码    

    private $url;            //当前URL
    private $bothnum;        //位于当前页码两边的页码数量
    private $limit;            //分页查询条件

    function __construct($_total,$_pagesize)
    {
        $this->_总条数 = $_total?$_total:1;
        $this->_每页显示条数  $_pagesize;
        $this->_总页码 = ceil($this->_总条数/$this->_每页显示条数)
        $this->_当前页码  $this->setPage();

        $this->url = $this->setUrl();
        $this->bothnum = 2;
        $this->limit = ‘LIMIT ‘.($this->_当前页码) * $this->_每页显示条数.‘,‘.$this->_每页显示条数;
    }
    


    private function setPage()
    {
        if(!empty($_GET[‘page‘]))
        {
            if($_GET[‘page‘] > 0)
            {
                if($_GET[‘page‘] > $this->_总页码)
                {
                    return $this->_总页码;
                }
                else
                {
                    return 1;                    
                }
            }
            else
            {
                return 1;
            }
        }
    }

    private function setUrl()
    {
        $_url = $_SERVER["REQUEST_URI"];
        $_para = parse_url($_url);
        if (isset($_par[‘query‘])) {
            parse_str($_par[‘query‘],$_query);
            unset($_query[‘page‘]);
            $_url = $_par[‘page‘]."?".http_build_query($_query);
        }
        return $_url;
    }

    private function pageList()
    {
        $_pagehtml = ‘‘;

        for ($i = $this->bothnum;$i>=1;$i--){
            $_page = $this->_当前页码 - $i;
            if ($_page < 1) break;
            $_pagehtml .= ‘<a href="‘.$this->_url.‘&page=‘.$_page.‘">‘.$_page.‘</a>‘;    
        }

        $_pagehtml .= ‘<span class="me">‘.$this->_当前页码.‘</span>‘;

        for ($i = 1;$i<= $this->bothnum;$i++){ 
            $_page = $this->_当前页码 + $i;
            if($_page > $this->_总页码) break;
            $_pagehtml .= ‘<a href="‘.$this->_url.‘&page=‘.$_page.‘">‘.$_page.‘</a>‘;    
        }

        return $_pagehtml;
    }

    private function first()
    {
        if ($this->_当前页码 > $this->bothnum + 1) {
            return ‘<a href = "‘.$this->url.‘">1</a>...‘;
        }
    }

    private function prev()
    {
        if ($this->_当前页码 == 1) {
            return ‘<span class="disabled">上一页</span>‘;
        }
        else
        {
            return ‘<a href="‘.$this->url.‘&page=‘.($this->_当前页码 - 1).‘">上一页</a>‘;
        }
    }

    private function next()
    {
        if ($this->_当前页码 == $this->_总页码) {
            return ‘<span class="disabled">下一页</span>‘;
        }
        else
        {
            return ‘<a href="‘.$this->url.‘&page=‘.($this->_当前页码 + 1).‘">下一页</a>‘;
        }
    }

    private function last()
    {
        if($this->_总页码 - $this->_当前页码 > $this->bothnum)
        {
            return ‘...<a href="‘.$this->url.‘&page=‘.$this->_总页码.‘">‘.$this->_总页码.‘</a>‘;
        }
    }

    public function showpage()
    {
        $_page .= $this->first();
        $_page .= $this->pageList();
        $_page .= $this->last();
        $_page .= $this->prev();
        $_page .= $this->next();
        return $_page;
    }
}

?>