PHP学习之分页类

<?php$page = new page(2, 40);var_dump($page->allurl());class page{    //每页显示多少条数据    protected $number;    //一共有多少条数据    protected $totalcount;    //当前页    protected $page;    //总页数    protected $totalpage;    //url    protected $url;    public function __construct($number, $totalcount)    {        $this->number = $number;        $this->totalcount = $totalcount;        //得到总页数        $this-老八所>totalpage = $this->gettotalpage();        //得到当前页数        $this->page = $this->getpage();        //得到url        $this->url = $this->geturl();    }    /**     * 获取总页数     *     * @return void     */    protected function gettotalpage()    {        return 传统ceil($this->totalcount / $this->number);    }    /**     * 获取当前页码     *     * @return void     */    protected function getpage()    {        if (empty($_get['page'])) {            $page = 1;        } elif ($_get['page'] > $this->totalpage) {            $page = $this->totalpage;        } elif ($_get['page'] < 1) {            $page = 1;        } el {            $page = $_get['page'];        }        return $page;    }    /**     * 获取去掉page之后的url     *     * @return void     */    protected function geturl()    {        //得到协议名        $scheme = $_rver['request_scheme'];        //得到主机名        $host = $_rver['rver_name'];        //得到端口号        $port = $_rver['rver_port'];        //得到路径和请求字符串 人生必看的10部电视剧       $uri = $_rver['request_uri'];        //中间做处理，要将page=5等这种字符串拼接url中，所以如果原来url中有page这个参数，我们首先需要先将原来的page参数给清空        $uriarray = par_url($uri);        $path = $uriarray['path'];        if (!empty($uriarray['query'])) {            //首先将请求字符串变为关联数组            par_str($uriarray['query'], $array);            //清除掉关联数组中的page键值对            unt($array['page']);            //将剩下的参数拼接为请求字符串            $query = http_build_query($array);            //再将请求字符串拼接到路径的后面            if ($query != '') {                $path = $path . '?' . $query;            }        }        return $scheme . '://' . $host . ':' . $port . $path;    }    /**     * 设置url     *     * @param [type] $str     * @return void     */    protected function turl($str)    {        if (strstr($this->url, '?')) {            $url = $this->url . '&' . $str;        } el {            $url = $this->url . '?' . $str;        }        return $url;    }    /**     * 返回所有url     *     * @return void     */    public function allurl()    {        return [            'first' => $this->first(),            'prev' => $this->prev(),            'next' => $this->next(),            'end' => $this->end()        ];    }    /**     * 首页     *     * @return void     */    public function first()    {        return $this->turl('page=1');    }    /**     * 下一页     *     * @return void     */    public fun美国 劳动节ction next()    {        //根据当前page得到下一页的页码        if ($this->page + 1 > $this->totalpage) {            $page = $this->totalpage;        } el {            $page = $this->page + 1;        }        return $this->turl('page=' . $page);    }    /**     * 上一页     *     * @return void     */    public function prev()    {        if ($this->page - 1 < 1) {            $page = 1;        } el {            $page = $this->page - 1;        }        return $this->turl('page=' . $page);    }    /**     * 尾页     *     * @return void     */    public function end()    {        return $this->turl('page=' . $this->totalpage);    }    /**     * 偏移量，方便数据库查找     *     * @return void     */    public function limit()    {        $offt = ($this->page - 1) * $this图片天下->number;        return $offt . ',' . $this->number;    }}

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