基于搜索内容自己写一个分页功能

　　前言：由于部分查询数据库代码是经过修饰的，所以看起来有点不对劲，但是不影响思路　

　　1.先写一个生成分页链接的类

<?php
/**
 * Created by PhpStorm.
 * User: lxj
 * Date: 2017/7/25
 * Time: 14:42
 */
class Page{
    protected $total;//总的结果数
    protected $page_size;//每页显示的记录数
    protected $page_now;//当前是第几页
    protected $url;//跳转链接时的URL
    public function __construct($total, $page_size, $page_now, $url){
        $this->total = $total;
        $this->page_size = $page_size;
        $this->page_now = $page_now;
        $this->url = $url;
    }
    public function createPage(){
        $url = $this->url."page=";
        //首页
        $html = <<<PAGEHTML
        <ul class="pageBar">
            <li>
                <a href="$this->url">首页</a>
            </li>
PAGEHTML;
        //分页列表，循环生成
        $page_count = ceil($this->total / $this->page_size);
        for($i = $this->page_now - 5;$i < $this->page_now + 5; $i++){
            if($i <= 1 || $i >= $page_count){
                continue;
            }
            $html .= <<<PAGEHTML
            <li>
                <a href="$url$i">$i</a>
            </li>
PAGEHTML;
        }
        //尾页
        $html .= <<<PAGEHTML
        <li>
            <a href="$url$page_count">尾页</a>
        </li>
PAGEHTML;
        $html .= " 当前为第".$this->page_now."页，共".$page_count."页，数据共".$this->total."条";
        //返回分页链接
        return $html;
    }
}

　　2.美化分页条的样式

　　

.pageBar{
    margin:15px 0 0 25px;
}
.pageBar li{
    display: inline-block;
    width:35px;
    text-align: center;
    border:1px solid silver;
    background: whitesmoke;
}
.pageBar a:link{
    color:steelblue;
    display: inline-block;
    width:35px;
    height:20px;
    text-decoration: none;
}
.pageBar a:hover{
    color:red;
    display: inline-block;
    width:35px;
    height:20px;
    text-decoration: none;
}
.pageBar a:visited{
    color:burlywood;
    display: inline-block;
    width:35px;
    height:20px;
    text-decoration: none;
}

　　3.调用分页类并传递参数

//生成分页链接start
        if($_GET['companyName']){
            $query_para['companyName'] = $_GET['companyName'];
        }
        if($_GET['addr_province']){
            $query_para['addr_province'] = $_GET['addr_province'];
        }
        if($_GET['area']){
            $query_para['area'] = $_GET['area'];
        }
        if($_GET['beginDT']){
            $query_para['beginDT'] = $_GET['beginDT'];
        }
        if($_GET['endDT']){
            $query_para['endDT'] = $_GET['endDT'];
        }if(count($query_para)){
            foreach($query_para as $key=>$value){
　　　　　　　　　 //如果是页面参数则不加入传递的链接链接中
                if($key == 'page'){
                    continue;
                }
                $query_string .= $key.'='.$value.'&';
            }
        }
        $nowUrl = "agtProductConsumeList.php?".$query_string;
        $pageObj = new Page($this->count,$this->one_page_num,$this->page_now,$nowUrl);
        $page_bar = $pageObj->createPage();
        //生成分页链接end

　　4.根据分页传递的页数搜索　

    public $one_page_num = 5;//每页显示记录数
    public $count;//总的记录数
    public $page_now;//当前页数

    protected function getInfo(){
　　　　 $ws = " where user_id > 10000";
　　　　 //搜索结果总数
        $rowCount = $this->mysqlObj->sr("select count(*) as num
                                    from user $ws");

        $this->count = $rowCount['num'];
        $first_row = ($this->page_now - 1) * $this->one_page_num;
        $last_row = $this->one_page_num;
        $ws .= " LIMIT ".$first_row.",".$last_row;
　　　　 $result = $this->mysqlObj->sr("select count(*) as num from user $ws");
    }