使用PHP实现简单分页类及其详细的使用方法

<?php

/*

 * 使用:

 * $page = new Page(连接符,查询语句,当前页码,每页大小,页码符)

 * 连接符:一个MYSQL连接标识符,如果该参数留空,则使用最近一个连接

 * 查询语句:SQL语句

 * 当前页码:指定当前是第几页

 * 每页大小:每页显示的记录数

 * 页码符:指定当前页面URL格式

 *

 * 使用例子:

 * $sql = "select * from aa";

 * $page = new Page($conn,$sql,$_GET['page'],4,"?page=");

 *

 * 获得当前页码

 * $page->page;

 *

 * 获得总页数

 * $page->pageCount;

 *

 * 获得总记录数

 * $page->rowCount;

 *

 * 获得本页记录数

 * $page->listSize;

 *

 * 获得记录集

 * $page->list;

 * 记录集是一个2维数组,例:list[0]['id']访问第一条记录的id字段值.

 *

 * 获得页码列表

 * $page->getPageList();

 */

class Page

{

  //基础数据

  var $sql;

  var $page;

  var $pageSize;

  var $pageStr;

  //统计数据

  var $pageCount; //页数

  var $rowCount; //记录数

  //结果数据

  var $list = array(); //结果行数组

  var $listSize ;

  //构造函数

  function Page($conn,$sql_in,$page_in,$pageSize_in,$pageStr_in)

  {

    $this->sql = $sql_in;

    $this->page = intval($page_in);

    $this->pageSize = $pageSize_in;

    $this->pageStr = $pageStr_in;

    //页码为空或小于1的处理

    if(!$this->page||$this->page<1)

    {

      $this->page = 1;

    }

    //查询总记录数

    $rowCountSql = preg_replace("/([\w\W]*?select)([\w\W]*?)(from[\w\W]*?)/i","$1 count(0) $3",$this->sql);

    if(!$conn)

      $rs = mysql_query($rowCountSql) or die("bnc.page: error on getting rowCount.");

    else

      $rs = mysql_query($rowCountSql,$conn) or die("bnc.page: error on getting rowCount.");

    $rowCountRow = mysql_fetch_row($rs);

    $this->rowCount=$rowCountRow[0];

    //计算总页数

    if($this->rowCount%$this->pageSize==0)

      $this->pageCount = intval($this->rowCount/$this->pageSize);

    else

      $this->pageCount = intval($this->rowCount/$this->pageSize)+1;

    //SQL偏移量

    $offset = ($this->page-1)*$this->pageSize;

    if(!$conn)

   $rs = mysql_query($this->sql." limit $offset,".$this->pageSize) or

   die("bnc.page: error on listing.");

    else

 $rs = mysql_query($this->sql." limit $offset,".$this->pageSize,$conn) or

 die("bnc.page: error on listing.");

    while($row=mysql_fetch_array($rs))

    {

      $this->list[]=$row;

    }

    $this->listSize = count($this->list);

  }

  /*

   * getPageList方法生成一个较简单的页码列表

   * 如果需要定制页码列表,可以修改这里的代码,或者使用总页数/总记录数等信息进行计算生成.

   */

  function getPageList()

  {

    $firstPage;

    $previousPage;

    $pageList;

    $nextPage;

    $lastPage;

    $currentPage;

    //如果页码>1则显示首页连接

    if($this->page>1)

    {

      $firstPage = "<a href=\"".$this->pageStr."1\">首页";

    }

    //如果页码>1则显示上一页连接

    if($this->page>1)

    {

      $previousPage = "<a href=\"".$this->pageStr.($this->page-1)."\">上一页";

    }

    //如果没到尾页则显示下一页连接

    if($this->page<$this->pageCount)

    {

      $nextPage = "<a href=\"".$this->pageStr.($this->page+1)."\">下一页";

    }

    //如果没到尾页则显示尾页连接

    if($this->page<$this->pageCount)

    {

      $lastPage = "<a href=\"".$this->pageStr.$this->pageCount."\">尾页";

    }

    //所有页码列表

    for($counter=1;$counter<=$this->pageCount;$counter++)

    {

      if($this->page == $counter)

      {

        $currentPage = "".$counter."";

      }

      else

      {

        $currentPage = " "."<a href=\"".$this->pageStr.$counter."\">".$counter.""." ";

      }

      $pageList .= $currentPage;

    }

    return $firstPage." ".$previousPage." ".$pageList." ".$nextPage." ".$lastPage." ";

  }

}

?>

示例：

<?php

@$db = mysql_connect('localhost', 'root', '123456') or

    die("Could not connect to database.");//连接数据库

mysql_query("set names 'utf8'");//输出中文

mysql_select_db('test');    //选择数据库

$sql = "select * from `users`"; //一个简单的查询

$page = new Page('',$sql,$_GET['page'],5,"?page=");

$rows = $page->list;

foreach($rows as $row)

{

  echo $row['UserName']."
";

}

echo $page->getPageList(); //输出分页列表

?>