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>";
?>
