php简单分页类

php简单分页类，方便演示，采用文件存放文章内容，用于php读取。

代码如下：

<?php

class Page{
	private $file;//文件内容 
	private $current;//当前页
	private $totalPage;//总的页数
	private $url;//url地址
	private $pageLen;//每页显示的内容长度
	function __construct($file,$len=500){
		$this->file = file_get_contents($file);
		$this->current=isset($_GET['page'])?$_GET['page']:1;
		$this->pageLen = $len;
		$this->totalPage = $this->getTotalPage();		
		$this->url= $this->getUrl();
	}
	//获取文件内容显示总共有多少页
	private function getTotalPage(){
		return ceil(strlen($this->file)/$this->pageLen);
	}
	//获得并分离url
	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.($this->current+1)."'>下一页</a>";
	}
	//末页
	private function end(){
		if($this->current<$this->totalPage) return "<a href='".$this->url.$this->totalPage."'>末页</a>";
	}
	//分页列表
	private function pager(){
		for ($i=1;$i<=$this->totalPage;$i++){
			if($i==$this->current){
				$pageListStr.="<span style='font-size:20px;color:#f00'>".$i."</span>";
			}else{
			$pageListStr.="<a href='".$this->url.$i."'>".$i."</a>";
			}
		}
		return $pageListStr;
	}
	//分页样式(显示方式,具体效果用css实现)
	public function pagerStyle($style=1){
		switch ($style){
			case 1:
				return "共有".$this->totalPage."页".$this->first().$this->pre().$this->pager().$this->next().$this->end();
				break;
			case 2;
				return $this->pager();
				break;
		}
	}
	//获取分页内容
	public function getContents(){
		$prePageLen = strlen($this->subStrs($this->current-1));
		$currentPageLen = strlen($this->subStrs($this->current));
		return substr($this->file, $prePageLen,$currentPageLen-$prePageLen);
	}
	//截取文件内容
	private function subStrs($page){
		$len= $page*$this->pageLen;
		for ($i = 0; $i < $len; $i++) {
			if(ord(substr($this->file,$i,1))>0xa0){//判断内容是否为中文字符，以防乱码
					$string.=substr($this->file,$i,2);
					$i++;	
			}else{
				$string.=substr($this->file,$i,1);
			}
		}
		return $string;
	}
}


$php = new Page('luojing.txt',1000);//实例化一个分页类对象
echo "<div style='font-size:14px;line-height:1.8em;color:#666;padding:6px;width:960px;height:450px;'>".$php->getContents()."</div>";
echo "<div style='border:solid 1px #ccc;font-size:14px;color:#333'>";
echo $php->pagerStyle();
echo "</div>";
?>

效果如下:(css你喜欢什么样 就可以做成什么样)