一个简单易用的PHP分页类

使用实例:

$sql = "select * from `table1`"; //一个简单的查询
$page = new Page('',$sql,$_GET['page'],20,"?page=");
$rows = $page->list;
foreach($rows as $row)
{
	echo $row['title']."<br>";
}

echo $page->getPageList();  //输出分页列表

<?
/*
 * 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</a>";
		}
		//如果页码>1则显示上一页连接
		if($this->page>1)
		{
			$previousPage = "<a href=\"".$this->pageStr.($this->page-1)."\">上一页</a>";
		}
		//如果没到尾页则显示下一页连接
		if($this->page<$this->pageCount)
		{
			$nextPage = "<a href=\"".$this->pageStr.($this->page+1)."\">下一页</a>";
		}	
		//如果没到尾页则显示尾页连接
		if($this->page<$this->pageCount)
		{
			$lastPage = "<a href=\"".$this->pageStr.$this->pageCount."\">尾页</a>";
		}
		//所有页码列表
		for($counter=1;$counter<=$this->pageCount;$counter++)
		{
			if($this->page == $counter)
			{
				$currentPage = "<b>".$counter."</b>";
			}
			else
			{
				$currentPage = " "."<a href=\"".$this->pageStr.$counter."\">".$counter."</a>"." ";
			}
			$pageList .= $currentPage;
		}
		
		return $firstPage." ".$previousPage." ".$pageList." ".$nextPage." ".$lastPage." ";
	}


}


?>