php 分页类

<?php

/*

 *本程序文件对分页程序进行了封装

 *

*/



class Page_Link

{

    var $page_max = 10; //一组页码的最大数



    var $page_num = 10; //总页数

    var $length = 20; //一页的数据条数



    var $isNextPage = true;

    var $isFirstPage = false;



    function Calculation_Page_Num( $total )

    {

        $this->page_num = ceil( $total / $this->length );

        return $this->page_num;

    }



    function Calculation_Min_Max( $act_page = 1 )

    {

        // 定义左右偏移量

        $py_left = 0;

        $py_right = 0;

        // 定义左右边界

        $bj_left = 0;

        $bj_right = 0;

        // 定义滚动区间边界

        $gd_left = 0;

        $gd_right = 0;

        // 判断是否需要分组

        if ( ( $this->page_num - $this->page_max ) <= 0 )

        {

            // 不需要分组

            $bj_left = 1;

            $bj_right = $this->page_num;

        }

        else

        {

            // 要进行分组

            // 判断容量的奇偶

            $tmp = $this->page_max % 2;

            if ( $tmp === 1 )

            {

                // 奇数

                $py_left = $py_right = ( $this->page_max - 1 ) / 2;

            }

            else

            {

                // 偶数

                $py_left = $this->page_max / 2 - 1;

                $py_right = $this->page_max / 2;

            }

            // 计算滚动区间

            $gd_left = 1 + $py_left;

            $gd_right = $this->page_num - $py_right;

            // 判断当前页是否落入了滚动区间

            if ( $act_page >= $gd_left && $act_page <= $gd_right )

            {

                // 区间内

                $bj_left = $act_page - $py_left;

                $bj_right = $act_page + $py_right;

            }

            else

            {

                // 区间外

                if ( ( $act_page - $py_left ) <= 1 )

                {

                    // 左侧固定区间

                    $bj_left = 1;

                    $bj_right = $this->page_max;

                }

                else

                {

                    $bj_left = $this->page_num - $this->page_max + 1;

                    $bj_right = $this->page_num;

                }

            }

        }



        $res = array();

        $res['min'] = $bj_left;

        $res['max'] = $bj_right;



        return $res;

       

    }

    // 主方法

    function make_page( $total, $act_page, $url, $param )

    {

        $page_num = $this->Calculation_Page_Num( $total );

        $arr_min_max = $this->Calculation_Min_Max( $act_page );

        

        if (!eregi("([?|&]$param=)", $url)) {

            $url = strpos($url,"?")===false?$url."?":$url."&";

            $url = $url."$param=0";

        }



        if ( $act_page > $page_num )

        {

            $act_page = $page_num;

        }

        // 用正则把url改成正规的

        $url = eregi_replace( $param . '=[0-9]+', $param . '=0', $url );



        $res = array();

        $d = 0;

        for( $i = $arr_min_max['min'];$i <= $arr_min_max['max'];$i++ )

        {

            if ( $i == $act_page )

            {

                $res[$d]['url'] = '';

                $res[$d]['name'] = $i;

                $res[$d]['no'] = $i;

            }

            else

            {

                $res[$d]['url'] = str_replace( $param . '=0', $param . '=' . $i, $url );

                $res[$d]['name'] = $i;

                $res[$d]['no'] = $i;

            }

            $d++;

        }



        if ( $this->isNextPage )

        {

            $res = $this->make_before_next_link( $res, $act_page, $url, $param );

        }

        if ( $this->isFirstPage )

        {

            $res = $this->make_first_end_link( $res, $act_page, $url, $param );

        }

        return $res;

    }

    //// 带总页数

    function make_page_with_total( $total, $act_page, $url, $param )

    {

        $page_num = $this->Calculation_Page_Num( $total );

        $arr_min_max = $this->Calculation_Min_Max( $act_page );

        

        if (!eregi("([?|&]$param=)", $url)) {

            $url = strpos($url,"?")===false?$url."?":$url."&";

            $url = $url."$param=0";

        }



        if ( $act_page > $page_num )

        {

            $act_page = $page_num;

        }

        // 用正则把url改成正规的

        $url = eregi_replace( $param . '=[0-9]+', $param . '=0', $url );



        $res = array();

        $d = 0;

        for( $i = $arr_min_max['min'];$i <= $arr_min_max['max'];$i++ )

        {

            if ( $i == $act_page )

            {

                $res[$d]['url'] = '';

                $res[$d]['name'] = $i;

                $res[$d]['no'] = $i;

            }

            else

            {

                $res[$d]['url'] = str_replace( $param . '=0', $param . '=' . $i, $url );

                $res[$d]['name'] = $i;

                $res[$d]['no'] = $i;

            }

            $d++;

        }



        if ( $this->isNextPage )

        {

            $res = $this->make_before_next_link( $res, $act_page, $url, $param );

        }

        if ( $this->isFirstPage )

        {

            $res = $this->make_first_end_link( $res, $act_page, $url, $param );

        }

        

        $total_num= ceil($total/$this->length);

        $result['total']=$total_num;

        $result['DATA']=$res;

        return $result;

    }

    

    // 附加上一页和下一页

    function make_before_next_link( $arr, $act, $url, $param )

    {

        $tmp = array();



        $before = $act - 1;

        $next = $act + 1;



        if ( $before < 1 )

        {

            $before = 1;

            $tmp[0]['url'] = '';

            $tmp[0]['name'] = "上一页";

            $tmp[0]['no'] = $before;

        }

        else

        {

            $tmp[0]['url'] = str_replace( $param . '=0', $param . '=' . $before, $url );

            $tmp[0]['name'] = "上一页";

            $tmp[0]['no'] = $before;

        }



        $counts = sizeof( $arr );

        $tmp_count = sizeof( $tmp );

        for( $i = 0;$i < $counts;$i++ )

        {

            $tmp[$tmp_count]['url'] = $arr[$i]['url'];

            $tmp[$tmp_count]['name'] = $arr[$i]['name'];

            $tmp[$tmp_count]['no'] = $arr[$i]['no'];

            $tmp_count++;

        }



        if ( $next > $this->page_num )

        {

            $next = $this->page_num;

            $tmp[$tmp_count]['url'] = '';

            $tmp[$tmp_count]['name'] = "下一页";

            $tmp[$tmp_count]['no'] = $next;

        }

        else

        {

            $tmp[$tmp_count]['url'] = str_replace( $param . '=0', $param . '=' . $next, $url );

            $tmp[$tmp_count]['name'] = "下一页";

            $tmp[$tmp_count]['no'] = $next;

        }



        return $tmp;

    }

    

    // 附加首页和尾页

    function make_first_end_link( $arr, $act, $url, $param )

    {

        $tmp = array();



        $before = 1;

        $next = $this->page_num;



        if ( $act == 1 )

        {

            $before = 1;

            $tmp[0]['url'] = '';

            $tmp[0]['name'] = "首页";

            $tmp[0]['no'] = $before;

        }

        else

        {

            $tmp[0]['url'] = str_replace( $param . '=0', $param . '=' . $before, $url );

            $tmp[0]['name'] = "首页";

            $tmp[0]['no'] = $before;

        }



        $counts = sizeof( $arr );

        $tmp_count = sizeof( $tmp );

        for( $i = 0;$i < $counts;$i++ )

        {

            $tmp[$tmp_count]['url'] = $arr[$i]['url'];

            $tmp[$tmp_count]['name'] = $arr[$i]['name'];

            $tmp[$tmp_count]['no'] = $arr[$i]['no'];

            $tmp_count++;

        }



        if ( $act == $this->page_num )

        {

            $tmp[$tmp_count]['url'] = '';

            $tmp[$tmp_count]['name'] = "尾页";

            $tmp[$tmp_count]['no'] = $next;

        }

        else

        {

            $tmp[$tmp_count]['url'] = str_replace( $param . '=0', $param . '=' . $next, $url );

            $tmp[$tmp_count]['name'] = "尾页";

            $tmp[$tmp_count]['no'] = $next;

        }



        return $tmp;

    }

    

     

    /**

     * 带上一页<，下一页>，省略号的分页

     * @param int $total        记录总条数

     * @param int $act_page        当前页码

     * @param string $url        url

     * @param int $maxpageicon    最大显示页码数

     * @param int $style        上一页，下一页显示样式

     * @param string $param        url参数

     */

    function make_page_with_points( $total,$act_page,$url,$maxpageicon,$style,$param )

    {

        $page_num = $this->Calculation_Page_Num( $total );        //总页数

        $arr_min_max = $this->Calculation_Min_Max( $act_page );        //最大页，最小页    

        if($total==0)

        {

             return "";



        }

        if( $act_page > $page_num )

        {

            $act_page = $page_num+1;

            $page_num = $page_num+1;

        }

        

        switch ($style){

            case 1:

                $name_before = '前一页';

                $name_next = '后一页';

                break;

            case 2:

                $name_before = '<';

                $name_next = '>';

                break;

            case 3:

                $name_before = '<<';

                $name_next = '>>';

                break;

            default:

                $name_before = '上一页';

                $name_next = '下一页';

        }

        

        if (!eregi("([?|&]$param=)", $url)) {

            $url = strpos($url,"?")===false?$url."?":$url."&";

            $url = $url."$param=0";

        }

                

        // 用正则把url改成正规的

        $url = eregi_replace( $param . '=[0-9]+', $param . '=0', $url );

        $res = array();

        $no_before = $act_page-1;

        $no_next = $act_page+1;

        

        //总页数如果小于等于初始化最大呈现页数

        if ($page_num<= ($maxpageicon + 1))

        {

            //如果当前页数是首页  上一页无效

            if ($act_page == 1)    

            {

                $res[0]['url'] = '';

                $res[0]['name'] = $name_before;

                $res[0]['no'] = $no_before;

            }

            else            //上一页有效

            {

                $res[0]['url'] = str_replace( $param . '=0', $param . '=' .($act_page - 1), $url );

                $res[0]['name'] = $name_before;

                $res[0]['no'] = $no_before;  

            }

            //循环添加页码

            $d = 1;

            for ($i = 1; $i <= $page_num; $i++)

            {

                if ($i != $act_page)

                {

                    $res[$d]['url'] = str_replace( $param . '=0', $param . '=' . $i, $url );

                    $res[$d]['name'] = $i;

                    $res[$d]['no'] = $i;

                }

                else    //当前页，页码

                {

                    $res[$d]['url'] = '';

                    $res[$d]['name'] = $i;

                    $res[$d]['no'] = $i;

                    $res[$d]['attr'] = 'current';

                }

                $d++;

            }

            $last_d = count($res);

            //判断尾页

            if($act_page == $page_num)    //下一页无效

            {

                $res[$last_d]['url'] = '';

                $res[$last_d]['name'] = $name_next;

                $res[$last_d]['no'] = $no_next;        

            }

            else

            {

                  $res[$last_d]['url'] = str_replace( $param . '=0', $param . '=' .($act_page + 1), $url );

                $res[$last_d]['name'] = $name_next;

                $res[$last_d]['no'] = $no_next;

            }

        }else if ($page_num > ($maxpageicon + 1))//如果总页数满足添加省略号

        { 

            if ($act_page <= $maxpageicon) //如果当前页小于等于初始化数目

            {

                //如果当前页数是首页  上一页无效

                if ($act_page == 1)    

                {

                    $res[0]['url'] = '';

                    $res[0]['name'] = $name_before;

                    $res[0]['no'] = $no_before;

                }

                else            //上一页有效

                {

                    $res[0]['url'] = str_replace( $param . '=0', $param . '=' .($act_page - 1), $url );

                    $res[0]['name'] = $name_before;

                    $res[0]['no'] = $no_before;  

                }

                //循环添加页码

                $d = 1;

                for ($i = 1; $i <= $maxpageicon; $i++)

                {

                    if ($i != $act_page)

                    {

                        $res[$d]['url'] = str_replace( $param . '=0', $param . '=' . $i, $url );

                        $res[$d]['name'] = $i;

                        $res[$d]['no'] = $i;

                    }

                    else    //当前页，页码

                    {

                        $res[$d]['url'] = '';

                        $res[$d]['name'] = $i;

                        $res[$d]['no'] = $i;

                        $res[$d]['attr'] = 'current';

                    }

                    $d++;

                }

                $last_d = count($res);

                //添加省略号

                $res[$last_d]['url'] = '';

                $res[$last_d]['name'] = '...';

                $res[$last_d]['no'] = '';

                //总页数

                $res[$last_d+1]['url'] = str_replace( $param . '=0', $param . '=' . $page_num, $url );

                $res[$last_d+1]['name'] = $page_num;

                $res[$last_d+1]['no'] = $page_num;

                //下一页

                $res[$last_d+1]['url'] = str_replace( $param . '=0', $param . '=' . ($act_page + 1), $url );

                $res[$last_d+1]['name'] = $name_next;

                $res[$last_d+1]['no'] = $no_next;         

            }else//如果当前页大于最大显示页面

            {

                if ($act_page > ($page_num - $maxpageicon))//满足后几页

                {

                    //上一页

                    $res[0]['url'] = str_replace( $param . '=0', $param . '=' .($act_page - 1), $url );

                    $res[0]['name'] = $name_before;

                    $res[0]['no'] = $no_before;

                    //第一页

                    $res[1]['url'] = str_replace( $param . '=0', $param . '=1', $url );

                    $res[1]['name'] = 1;

                    $res[1]['no'] = 1;   

                    //省略号

                    $res[2]['url'] = '';

                    $res[2]['name'] = '...';

                    $res[2]['no'] = '';  

                    $d = 3;

                    for ($i = ($page_num - $maxpageicon + 1); $i <= $page_num; $i++)

                    {

                        if ($i != $act_page)

                        {

                            $res[$d]['url'] = str_replace( $param . '=0', $param . '=' . $i, $url );

                            $res[$d]['name'] = $i;

                            $res[$d]['no'] = $i;

                        }

                        else    //当前页，页码

                        {

                            $res[$d]['url'] = '';

                            $res[$d]['name'] = $i;

                            $res[$d]['no'] = $i;

                            $res[$d]['attr'] = 'current';

                        }

                        $d++;

                    }

                    $last_d = count($res);

                    //判断尾页

                    if($act_page == $page_num)    //下一页无效

                    {

                          $res[$last_d]['url'] = '';

                        $res[$last_d]['name'] = $name_next;

                        $res[$last_d]['no'] = $no_next;        

                    }

                    else

                    {

                          $res[$last_d]['url'] = str_replace( $param . '=0', $param . '=' .($act_page + 1), $url );

                        $res[$last_d]['name'] = $name_next;

                        $res[$last_d]['no'] = $no_next;

                    }



                }else//满足处在中间

                {

                    //上一页

                    $res[0]['url'] = str_replace( $param . '=0', $param . '=' .($act_page - 1), $url );

                    $res[0]['name'] = $name_before;

                    $res[0]['no'] = $no_before;

                    //第一页

                    $res[1]['url'] = str_replace( $param . '=0', $param . '=1', $url );

                    $res[1]['name'] = 1;

                    $res[1]['no'] = 1;   

                    //省略号

                    $res[2]['url'] = '';

                    $res[2]['name'] = '...';

                    $res[2]['no'] = '';  

                    for ($i = ($act_page - ($maxpageicon - 2) / 2); $i <= floor($act_page+($maxpageicon - 2) / 2); $i++)

                    {

                        $i = ceil($i);

                        if ($i != $act_page)

                        {

                            $res[$d]['url'] = str_replace( $param . '=0', $param . '=' . $i, $url );

                            $res[$d]['name'] = $i;

                            $res[$d]['no'] = $i;

                        }

                        else    //当前页，页码

                        {

                            $res[$d]['url'] = '';

                            $res[$d]['name'] = $i;

                            $res[$d]['no'] = $i;

                            $res[$d]['attr'] = 'current';

                        }

                        $d++;

                   }

                    $last_d = count($res);

                    //加省略号

                    $res[$last_d]['url'] = '';

                    $res[$last_d]['name'] = '...';

                    $res[$last_d]['no'] = '';

                    //当前页

                    $res[$last_d+1]['url'] = str_replace( $param . '=0', $param . '=' . $page_num, $url );

                    $res[$last_d+1]['name'] = $page_num;

                    $res[$last_d+1]['no'] = $page_num;        

                    //下一页

                    $res[$last_d+2]['url'] = str_replace( $param . '=0', $param . '=' . ($act_page + 1), $url );

                    $res[$last_d+2]['name'] = $name_next;

                    $res[$last_d+2]['no'] = $no_next;

                    //exit;    

                 }

            }

        }

        return $res;

    }

}



?>

$page_no = $_GET['page_no'] ? $_GET['page_no'] : 1;

$count = 20;

$start = ($page_no-1)*$count;

$end = $start + $count;

$page = new Page_Link();

$page->length = $count;

$page->isFirstPage = true;

$url = $_SERVER['SCRIPT_NAME']."?&a=".$a;

$page_arr = $page->make_page($total_num,$page_no,$url,"page_no");

支持多种样式：