文件内容操作的分页类

 
<?php 
class StrPage {
    private $current;           //当前页  
    private $file;              //操作文件
    private $totalPage;         //总的页数
    private $url;               //传递的参数
    private $pageLen;           //每页显示的长度
  
    function __construct( $file,$len = 200 ){
        $this->file = file_get_contents($file);
        $this->pageLen = $len;
        $this->current = isset($_GET['page'])?$_GET['page']:1;
        $this->totalPage = $this->getTotalPage();
        $this->url = $this->getUrl();
    }
  
  
    //获取到这个文件总的长度
    private function getTotalPage(){
        return ceil(strlen($this->file)/$this->pageLen);
    }
  
    //获取当前传递的参数,保留参数，page参数动态变化
    private function getUrl(){
        $url =parse_url($_SERVER['REQUEST_URI']);
        parse_str($url['query'],$queryArr);
        unset($queryArr['page']);
        $queryStr = http_build_query($queryArr);
        return  $url['path'].'?'.$queryStr.'&page=';        
    }
  
  
    //首页
    private function first(){
        if($this->current>1)
            return "<a href='".$this->url."1'>首页</a>";
    }
    //上一页
    private function pre(){
        if( $this->current > 1 )
            return "<a href='".$this->url.($this->current-1)."'>上一页</a>";
    }
    //下一页
    private function next(){
        if( $this->current < $this->totalPage)
            return "<a href='".$this->url.($this->current+1)."'>下一页</a>";
    }
    //最后一页
    private function end(){
        if( $this->current < $this->totalPage )
            return "<a href='".$this->url.$this->totalPage."'>末页</a>";
    }
  
    public function pageList(){
        $pageListStr = '';
        for ($i=1;$i<=$this->totalPage;$i++){
            if($i==$this->current){
                $pageListStr.="<span style='font-size:20px;color:#f00'>".$i."</span>&nbsp;";
            }else{
            $pageListStr.="<a href='".$this->url.$i."'>".$i."&nbsp;</a>";
            }
        }
        return $pageListStr;
        }
  
        public function pageStyle($style=1){
            switch ($style){
                case 1:
                    return "共有".$this->totalPage."页".$this->first().$this->pre().$this->pageList().$this->next().$this->end();
                    break;
                case 2;
                return $this->pageList();
                break;
            }
        }
  
        public function getContents(){
        $prePageLen = strlen($this->subStrs($this->current-1));
        $currentPageLen = strlen($this->subStrs($this->current));
        return substr($this->file, $prePageLen,$currentPageLen-$prePageLen);
        }
  
        public function subStrs($page){     
            $string = '';
            $len= $page*$this->pageLen;
            for( $i=0; $i<$len; $i++ ){
                    if( ord(substr($this->file,$i,1))>0xa0 ){
                        $string .= substr($this->file,$i,3);
                        $i = $i+2;
                }else{
                    $string .= substr($this->file, $i,1);
                }
            }
            return $string;
              
        }
  
}