万能的php分页类

<?php /*核心:首页、上一页、下一页、尾页的url*/ /*超全局$_SERVER*/ $page = new Page(5,60); var_dump($page->allUrl()); class Page{ // 每页显示的个数 protected $number; // 一共有多少数据 protected $totalCount; // 当前页 protected $page; // url protected $url; public function __construct($number,$totalCount){ $this->number= $number; $this->totalCount = $totalCount; //得到总页数 $this->totalPage = $this->getTotalPage(); //得到当前页数 $this->page = $this->getPage(); //得到URL $this->url = $this->getUrl(); echo $this->url; } /*得到总页数并向上取整*/ protected function getTotalPage(){ return ceil($this->totalCount/$this->number); } /**/ protected function getPage(){ if (empty($_GET['page'])){ $page=1; }elseif ($_GET['page'] > $this->totalPage){ $page = $this->totalPage; }elseif ($_GET["page"]<1){ $page = 1; }else{ $page = $_GET['page']; } return $page; } protected function getUrl(){ //得到协议名 $scheme = $_SERVER['REQUEST_SCHEME']; //得到主机名 $host= $_SERVER['SERVER_NAME']; //得到端口号 $port = $_SERVER['SERVER_PORT']; //得到路径和请求字符串 $url = $_SERVER['REQUEST_URI']; /*中间做处理,要将page=5等这种字符串拼接URL 中，所以如果原来的url中有page这个参数，我们首先 需要将原来的page参数给清空*/ $urlArray = parse_url($url); // var_dump($urlArray); $path = $urlArray['path']; if (!empty($urlArray['query'])){ //将query中的值转化为数组 parse_str($urlArray['query'],$array); //如果他有page就将它删掉 unset($array['page']); //将关联数组转化为query $query = http_build_query($array); //不为空的话就与path连结 if ($query != ''){ $path = $path.'?'.$query; } } return 'http://'. $host.':'.$port.$path; } protected function setUrl($str){ if (strstr($this->url, '?')){ $url = $this->url.'&'.$str; }else{ $url = $this->url.'?'.$str; } return $url; } /*所有的url*/ public function allUrl(){ return [ 'first' => $this->first(), 'next' => $this->next(), 'prev'=> $this->prev(), 'end'=> $this->end(), ]; } /*首页*/ public function first(){ return $this->setUrl('page=1'); } /*下一页*/ public function next(){ //根据当前page得带下一页的页码 if ($this->page+1 > $this->totalPage) { $page = $this->totalPage; }else{ $page = $this->page+1; } return $this->setUrl('page='.$page); } /*上一页*/ public function prev(){ //根据当前page得带下一页的页码 if ($this->page - 1 < 1) { $page = 1; }else{ $page = $this->page-1; } return $this->setUrl('page='.$page); } /*尾页*/ public function end(){ return $this->setUrl('page='.$this->totalPage); } /*limit 0,5*/ public function limit(){ $offset = ($this->page-1)*$this->number; return $offset.','.$this->number; } }