PHP encapsulated page paging class

This article mainly introduces the page paging class encapsulated by PHP, and analyzes the related techniques of PHP numerical operations and string operations to realize the paging function in the form of a complete example. Friends in need can refer to it

The details are as follows :

Class file:

<?php
  //分页工具类
  class Page{
    /*
     * 获取分页字符串
     * @param1 string $uri，分页要请求的脚本url
     * @param3 int $counts，总记录数
     * @param4 int $length，每页显示的记录数
     * @param5 int $page = 1，当前页码
     * @return string，带有a标签的，可以点击发起请求的字符串
    */
    public static function getPageStr($uri,$counts,$length,$page = 1){
      //构造一个能够点击的字符串
      //得到数据显示的字符串
      $pagecount = ceil($counts/$length);        //总页数
      $str_info = "当前一共有{$counts}条记录，每页显示{$length}条记录，一共{$pagecount}页，当前是第{$page}页";
      //生成可以操作的连接：首页 上一页 下一页 末页
      //求出上一页和下一页页码
      $prev = ($page <= 1) ? 1 : $page - 1;
      $next = ($page >= $pagecount) ? $pagecount : $page + 1;
      $str_click = <<<END
        <a href="{$uri}?page=1">首页</a>
        <a href="{$uri}?page={$prev}">上一页</a>
        <a href="{$uri}?page={$next}">下一页</a>
        <a href="{$uri}?page={$pagecount}">末页</a>
END;
      //按照页码分页字符串
      $str_number = &#39;&#39;;
      for($i = 1;$i <= $pagecount;$i++){
        $str_number .= "<a href=&#39;{$uri}?page={$i}&#39;>{$i}</a> ";
      }
      //下拉框分页字符串：利用js的onchang事件来改变当前脚本的href
      $str_select = "<select onchange=\"location.href=&#39;{$uri}?page=&#39;+this.value\">";
      //将所有的页码放入到option
      for($i = 1;$i <= $pagecount;$i++){
        if($i == $page)
          $str_select .= "<option value=&#39;{$i}&#39; selected=&#39;selected&#39;>{$i}</option>";
        else
          $str_select .= "<option value=&#39;{$i}&#39;>{$i}</option>";
      }
      $str_select .= "</select>";
      //返回值
      return $str_info . $str_click . $str_number . $str_select;
    }
}

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