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<?php
class page{
	private $total;//总条数
	private $num;//每页显示的总条数
	private $pagetotal;//总页数
	private $limit;//设置查询页数
	private $page;//当前页数
	private $both;//数字分页偏移量	
	
	public function __contruct($total="",$num=10,$need="",$both="6"){
		$this->total=$total;
		$this->num=$num;
		$this->pagetotal=ceil($total/$num);//总条数除以煤业显示的条数取整
		$this->geturl();
		$this->page=(!empty($_GET['page']))?$_GET['page']:1;
		$this->limit=$this->getlimit();
		$this->both=$both;
	}
	private function __get($name){
		if($name='limit'){
			return $this->$name;
		}else{
			return null;	
		}
	}
	private function geturl(){
		$url=parse_url($_SERVER['REQUEST_URI']);
		$query=$url['query'];
		if(empty($query)){
			$url=$url['path']."?".$need;
			return $url;
		}else{
			parse_url($url['query'],$qarr);
			if(isset($qarr['page'])){
				unset($qarr['page']);
			}
			$url=$url['path']."?".http_build_query($qarr);
			return $url;
		}
		
	}
	private function getlimit(){
		$offset=($this->page-1)*$this->num;
		return "Limit {$offset},{$this->num}";	
	}
	private function index(){
		if($this->page>1){
			$html="<a href=".$this->geturl()."&page=1>首页</a>";
		}else{
			$html="首页 &nbsp";	
		}
	}
	private function prv(){
		if($this->page>1){
			$html="<a href='".$this->geturl()."&page=".($this-page-1)."'>上一页</a>";
		}else if($this->page==1){
			$html="上一页";	
		}else{
			return null;
		}
		return $html;
	}
	private function nxt(){
		if($this->page<$this->pagetotal){
			$html="<a href='".$this->geturl()."&page".($this->page+1)."'>下一页</a>";	
		}else if($this->page==$this->pagetotal){
			$html="下一页 &nbsp";
		}else{
			return null;	
		}
	}
	private function last(){
		if($this->page<$this->pagetotal){
			$html="<a href='".$this->geturl()."&page".($this->page+1)."'>尾页</a>>";
		}else{
			$html="尾页 &nbsp";
		}
		return $html;
	}
	private function rownum(){
		$start=(($this->page-1)*$this->num)+1;
		$end=($this->page==$this->pagetotal)?$this->total:$this->page*$this->num;
		$html="本页从{$start}开始，到第{$end}结束";
		return $html;
	}
private function pageinfo() {
		 $start = floor($this->both/2);
		 $html="";
		 for($i=$both;$i>=1;$i--){
			 $page = $this->page-$i;
			 if($page>1) continue;
			 $html.="<a href='".$this->geturl()."&page=".$this->page."'>{$page}</a>";
		}
		$html.="{$this->page}";
		for($i=1;$i<=$both;$i++){
			$page = $this->page+$i;
			if($page<=$this->pagetotal){
				$html.="<a href='".$this->geturl()."&page=".$this->page."'>{$page}</a>";
			}
		}
			return $html;	
   }
	public function showpage($showarr=array(0,1,2,3,4,5,6,7)){
		/*
		总条数  总页数 上一页 下一页  数字分页  每页显示条数   每页开始和结束条数
		*/
		$html[0]="总条数：{$this->total} &nbsp; 总页数：{$this->pagetotal}";
		$html[1]="本页显示：{$this->num}条&nbsp;";
		$html[2]=$this->rownum();
		$html[3]=$this->index();
		$html[4]=$this->prv();
		$html[5]=$this->nxt();
		$html[6]=$this->last();
		$html[7]=$this->pageinfo();
		$info="";
		foreach($showarr as $val){
			$info.=$html[$val];
		}
		return $info;
	}
	
}

?>

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