receive_sms/Library/Pager.php

<?php
namespace Heanup\Library;

class Pager
{

    private static $show_num = 9;
 // 分页中显示多少个
    private static $conf = array(
        'first_last' => 1, // 首页-尾页 0-关闭 1-开启
        'back_next' => 1, // 上一页-下一页 0-关闭 1-开启
        'total_num' => 1, // 是否显示总页数 0-关闭 1-开启
        'page_num' => 1, // 翻页数 0-关闭 1-开启
        'select' => 1
    );
 // 下拉列表选择 0-关闭 1-开启
    private static $style_config = '<style type="text/css">
	.InitPHP_pages {font:12px/1.6em Helvetica, Arial, sans-serif;overflow:hidden; text-align:center; font-family:Verdana;margin-bottom:5px;  }
	.InitPHP_pages a, .pages{ margin:0 1px; padding:1px 6px; border:1px solid #E4E4E4; text-decoration:none!important; }
	.InitPHP_pages a:hover { border-color:#369; }
	.InitPHP_pages strong { margin:0 1px; padding:2px 6px; border-color:#369; background:#369; color:#FFF; text-decoration:none!important; }
	.InitPHP_pages .back { padding:4px 6px 1px 20px!important; padding:4px 6px 2 20px;  font-family:simsun; }
	.InitPHP_pages .next { padding:4px 20px 1px 6px!important; padding:4px 20px 2 6px; font-family:simsun; }
	.InitPHP_pages .first { padding:4px 6px 1px 4px!important; padding:4px 6px 2 4px;  font-family:simsun; }
	.InitPHP_pages .last { padding:4px 4px 1px 6px!important; padding:4px 4px 2 6px; font-family:simsun; }
	</style><script>function go_to(_target){self.location.href=$(_target).attr("turn-url");}</script>';

    /**
     * 分页-分页入口
     *
     * @param int $count
     *            总共多少数据
     * @param int $prepage
     *            每页显示多少页
     * @param int $url
     *            URL
     * @return string
     */
    public static function pager($count, $prepage, $url, $page, $default_style = TRUE): string
    {
        $count = (int) $count;
        $prepage = (int) $prepage;
        $page_num = ceil($count / $prepage); // 总共多少页
        $page = (int) $page;
        $page = ($page > $page_num) ? $page_num : ($page = ($page < 1) ? 1 : $page);
        $url = (strpos($url, '?') === false) ? $url . '?' : $url;
        return self::pager_html($page_num, $url, $page, $default_style);
    }

    /**
     * 分页-获取分页HTML显示
     *
     * @param int $page_num
     *            页数
     * @param string $url
     *            URL
     * @param int $page
     *            当前页
     * @return string
     */
    private static function pager_html($page_num, $url, $page, $default_style)
    {
        list ($start, $end) = self::get_satrt_and_end($page, $page_num);
        list ($back, $next) = self::get_pager_next_back_html($url, $page, $page_num);
        list ($first, $last) = self::get_first_last_html($page_num, $url);
        if ($default_style == true) {
            $html = self::$style_config . "<div class='InitPHP_pages'>";
        } else {
            $html = "<div class='InitPHP_pages'>";
        }
        $html .= $back;
        $html .= $first;
        $html .= self::get_pager_num_html($start, $end, $url, $page);
        $html .= $last;
        $html .= $next;
        $html .= self::get_total_num_html($page_num);
        $html .= self::get_select_html($page_num, $url, $page);
        $html .= '</div>';
        return $html;
    }

    /**
     * 分页-获取分页数字的列表
     *
     * @param int $start
     *            开始数
     * @param int $end
     *            结束数
     * @param string $url
     *            URL地址
     * @param int $page
     *            当前页
     * @return string
     */
    private static function get_pager_num_html($start, $end, $url, $page)
    {
        if (self::$conf['page_num'] == 0)
            return ''; // 是否开启
        $html = '';
        for ($i = $start; $i <= $end; $i ++) {
            if ($i == $page) {
                $html .= "<strong>{$i}</strong>";
            } else {
                $html .= "<a  href='javascript:void(0);' turn-url='{$url}&page={$i}' onclick='go_to(this);'>{$i}</a>";
            }
        }
        return $html;
    }

    /**
     * 分页-分页总页数显示
     *
     * @param int $page_num
     *            页数
     * @return string
     */
    private static function get_total_num_html($page_num)
    {
        if (self::$conf['total_num'] == 0)
            return ''; // 是否开启
        return "&nbsp;&nbsp;共{$page_num}页";
    }

    /**
     * 分页-分页首页和尾页显示
     *
     * @param int $page_num
     *            页数
     * @param string $url
     *            URL地址
     * @return string
     */
    private static function get_first_last_html($page_num, $url)
    {
        if (self::$conf['first_last'] == 0)
            return array(
                '',
                ''
            ); // 是否开启
        $first = "<a href='javascript:void(0);' turn-url='{$url}&page=1' onclick='go_to(this);' class='first'>首页</a>";
        $last = "<a href='javascript:void(0);' turn-url='{$url}&page={$page_num}' onclick='go_to(this);' class='last'>尾页</a>";
        return array(
            $first,
            $last
        );
    }

    /**
     * 分页-获取分页上一页-下一页HTML
     *
     * @param string $url
     *            URL地址
     * @param int $page
     *            当前页
     * @param int $page_num
     *            页数
     * @return string
     */
    private static function get_pager_next_back_html($url, $page, $page_num)
    {
        if (self::$conf['back_next'] == 0)
            return array(
                '',
                ''
            ); // 是否开启
        $next_page = $page + 1;
        $next = "<a href='javascript:void(0);' turn-url='{$url}&page={$next_page}' onclick='go_to(this);' class='next'>下一页</a>";
        if ($page == $page_num)
            $next = '';
        $back_page = $page - 1;
        $back = "<a href='javascript:void(0);' turn-url='{$url}&page={$back_page}' onclick='go_to(this);' class='back'>上一页</a>";
        if ($page == 1)
            $back = '';
        return array(
            $back,
            $next
        );
    }

    /**
     * 分页-Select选择器
     *
     * @param int $page_num
     *            页数
     * @param string $url
     *            URL地址
     * @param int $page
     *            当前页
     * @return string
     */
    private static function get_select_html($page_num, $url, $page)
    {
        if (self::$conf['select'] == 0)
            return '';
        $html = '&nbsp;&nbsp;<select name="select" onchange="javascript:window.location.href=this.options[this.selectedIndex].value">';
        for ($i = 1; $i <= $page_num; $i ++) {
            if ($page == $i) {
                $selected = ' selected';
            } else {
                $selected = '';
            }
            $html .= "<option value='{$url}&page={$i}' {$selected}>{$i}</option>";
        }
        $html .= '</select>';
        return $html;
    }

    /**
     * 分页-获取分页显示数字
     *
     * @param int $page
     *            当前页
     * @param int $page_num
     *            页数
     * @return array(start, end)
     */
    private static function get_satrt_and_end($page, $page_num)
    {
        $temp = floor(self::$show_num / 2);
        if ($page_num < self::$show_num)
            return array(
                1,
                $page_num
            );
        if ($page <= $temp) {
            $start = 1;
            $end = self::$show_num;
        } elseif (($page_num - $temp) < $page) {
            $start = $page_num - self::$show_num + 1;
            $end = $page_num;
        } else {
            $start = $page - $temp;
            $end = $page - $temp + self::$show_num - 1;
        }
        return array(
            $start,
            $end
        );
    }
}