简单的分页类

<?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</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.” “.$lastPage.” “; 
    } 
} 
?>
<?php
@$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’].”<br>”; 
}  
echo $page->getPageList();  //输出分页列表 
?>

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