php 分页类 扩展代码

原来发表过一个脱离数据库的分页类，最近使用的时候发现有些时候搜索的东西过于大的时候，采用url传递参数的方式，可能会有一定的影响或者叫已知的bug，这次做了一些扩展，同时兼容了以前的模式，使用上面很简单的，只需要多设置一个参数就可以了代码如下：

<?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 <[e-mail]>
*/

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();
*/
?>