<?php
/**
* 功能: 分页类，根据提供的数据总量和页面大小
* 创建日期:Fri Apr 20 16:45:21 CST 2007
* 最后更新:
* 作者: sanshi <sanshi0815@tom.com>
*/

class pagination
{
    var $result = array();
    var $pVar = "myp";//page参数分页记数
    var $urlParamStr = ""; //页面的所有参数
    var $sqlMoveNumber = 0; //数据的偏移量
    var $is_post = false;

    public function pagination()
    {

    }
    public function set($sum,$pageSize,$page="",$is_post = false)
    {
        $this->is_post = $is_post;
        $this->pVar = defined('PAGE_BAR') ? PAGE_BAR : 'myp' ;
        $url = $_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
        //计算出总页数
        $curPage = $this->getCurPage();

        $temp['sumPage'] = ceil($sum/$pageSize);
        //修改了,页码超出的bug
        if($curPage>$temp['sumPage']) $curPage=$temp['sumPage'];
        $temp['curPage'] = $curPage;
        $temp['nextPage'] = $temp['sumPage'] > $curPage ? ($curPage+1) : $temp['sumPage'];
        $temp['upPage'] = $curPage >1 ? $curPage-1 :1;
        $temp['endPage'] = $temp['sumPage'];
        $this->urlParamStr = $this->_makeUrl($url);
        $temp['urlPageStr'] = ($page=="") ? $this->_makeUrl($url) : $page.$this->urlParamStr;

        $this->sqlMoveNumber = $curPage <2 ? 0 : ($curPage-1)*$pageSize;
        $temp['sqlMoveNumber'] = $this->sqlMoveNumber;
        $temp['rowNo'] = $sum;
        $this->result = $temp;
        return $this->result;
        //print_r($temp);exit();
    }
    public function getSqlMove()
    {
        return $this->sqlMoveNumber;
    }
    public function getFooter()
    {
        $str= "共有 <FONT COLOR=#FF0033>{$this->result['rowNo']}</FONT> 条 <a href='{$this->result['urlPageStr']}{$this->result['upPage']}'";
        if($this->is_post) $str .=" onclick='return sanshi_page_post(this.href,{$this->result['upPage']});' ";
        $str .=" >上一页</a> ";
        $str .=" 当前 {$this->result['curPage']} 页";
        $str .=" 共有 {$this->result['sumPage']} 页";
        $str .=" <a href='{$this->result['urlPageStr']}{$this->result['nextPage']}'";
        if($this->is_post) $str .=" onclick='return sanshi_page_post(this.href,{$this->result['nextPage']});' ";
        $str .=" >下一页</a>";
        return $str;
    }
    public function getJumpPage()
    {
        if($this->is_post)
        {
            $str = " 跳到第 <select name='topage' size='1' onchange='sanshi_page_post(\"{$this->result['urlPageStr']}\"+this.value,this.value)'>\n";
        }else{
            $str = " 跳到第 <select name='topage' size='1' onchange='window.location=\"{$this->result['urlPageStr']}\"+this.value'>\n";
        }
for($i=1;$i<=$this->result['sumPage'];$i++)
{
$str .= ($i==$this->result['curPage']) ? "<option value='$i' selected>$i</option>\n" : "<option value='$i'>$i</option>\n";
}
$str.="</select> 页";
         //输出form表单
        if($this->is_post)
        {
            $str .="<script type="text/javascript"><!--
            function sanshi_page_post(jump_link,page_no)
            {
                document.getElementById('sanshi_goPage').action = jump_link; document.getElementById('{$this->pVar}').value = page_no;
                document.getElementById('sanshi_goPage').submit();
                return false;
            }

// --></script>";
            $str .="<form name='sanshi_goPage' id='sanshi_goPage' method=post>";
            $str .="<input type=\"hidden\" name='{$this->pVar}' id='{$this->pVar}' value=0>";
            $_POST = isset($_POST) ? $_POST : array();
            foreach($_POST AS $k=>$v)
            {
                $str .="<input type=\"hidden\" name=\"{$k}\" id=\"{$k}\" value=\"{$v}\">";
            }
            $str .="</form>";
        }
return $str;
    }
    public function getCurPage()
    {
        return isset($_GET[$this->pVar]) ? intval($_GET[$this->pVar]) : 1 ;
    }
    //分析出url的参数返回？后的参数，页码为空 包括问号
    private function _makeUrl($url)
    {
        $arrayUrl=parse_url($url);
        if(isset($arrayUrl['query']))
        {
            $q=$arrayUrl['query'];
            parse_str($q,$qParam);
            //print_r($qParam);
            if(array_key_exists($this->pVar,$qParam))
            {
                foreach ($qParam AS $k=>$v)
                {
                    if($k !=$this->pVar) $temp[$k] = $v;
                }
                $temp[$this->pVar] = "";
                if(function_exists("http_build_query"))
                    return '?'.http_build_query($temp);
                else
                    return '?'.sanshi_http_build_query($temp);
            }else {
                return "?{$q}&{$this->pVar}=";
            }
        }else{
            return "?{$this->pVar}=";
        }

    }
}
function sanshi_http_build_query($a,$b='',$c=0)
{
    if (!is_array($a)) return false;
    foreach ((array)$a as $k=>$v)
    {
        if ($c)
            $k=$b."[".$k."]";
        elseif (is_int($k))
            $k=$b.$k;
        if (is_array($v)||is_object($v))
        {
            $r[]=http_build_query($v,$k,1);
            continue;
        }
        $r[]=$k."=".urlencode($v);
    }
    return implode("&",$r);
}
/*
//print_r($_SERVER);
$p = new pagination();
$p->set(10,2,'thi.php');
echo $p->getFooter();
echo $p->getJumpPage();
*/
?>