PHP简单分页组件封装实现

Sian

项目链接：http://www.yusian.com/thread-11071-1-1.html

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<?php
	class Page{
		// 总数、每页条数、总页数、当前页码、基础url、起始条、结束条
		private $total, $number, $pages, $url, $start, $end;
		public $cpage;
		// 构造方法
		public function __construct($total = 200, $number = 10){
			$this->total = $total;
			$this->number = $number;
			$this->pages = $this->get_pages();
			$this->cpage = isset($_GET["page"]) ? $_GET["page"] : 1;
			$this->start = ($this->cpage - 1) * $this->number + 1;
			$end = $this->start + $number - 1;
			$this->end = ($end > $total) ? $total : $end;
		}
		// 1、设置当前url，方便参数传递
		public function set_current_url($url){
			if (strlen($url) == 0) $url = "./?";
			$this->url = $url."&";
		}
		
		// 2、获取分页组件主体
		public function fpage(){
			$array = array();
			$number = $this->end - $this->start + 1;
			// 将各种下标放到一个数组里再拼接，可根据需要加减组合
			if($this->total) $array[] = "第{$this->start}-{$this->end}条";
			if($this->pages > 1) $array[] = $this->cpage."/".$this->pages;
			$array[] = $this->first();
			if($this->pages > 1) $array[] = $this->flist();
			$array[] = $this->last();
			$array[] = "共{$this->total}条记录";
			$array[] = "本页显示{$number}条记录";
			$string = "";
			foreach($array as $title){
				$string .= $title."  ";
			}
			return $string;
		}
		
		// 3、数据库查询分页指令
		public function limit(){
			return "LIMIT {$this->start}, {$this->number}";
		}
		
		/************************私有方法****************************/
		// 计算总页数
		private function get_pages(){
			// ceil相当于(($this->total - 1)/$this->number)+1;
			return ceil($this->total/$this->number);
		}
		// 首页 上一页
		private function first(){
			$prev_num = $this->cpage - 1;
			// 首页链接
			$home_str = "<a href={$this->url}>首页</a>";
			// 上一页链接，通过url?page=n来实现
			$prev_str = "<a href={$this->url}page="."{$prev_num}>上一页</a>";
			// 如果当前页是第1页，则不显示
			return ($this->cpage > 1) ? $home_str." ".$prev_str : NULL;
		}
		// 中间页码表
		private function flist(){
			$list = "";
			// 默认情况下显示9个页码链接，如果总页数少于9个，则按最大数显示
			$count = $this->pages > 9 ? 9 : $this->pages;
			// 如果是9个，则前面4个后面4个，中间一个，因此循环从当前页往前数4个
			$num = ceil($this->cpage - $count / 2);
			// 如果前面不足4个，则直接从第1页开始
			if ($this->cpage < $count / 2){
				$num = 1;
			}
			// 如果后面不足4个，则最大只到最后一页
			if ($this->cpage >= ($this->pages - $count / 2)){
				$num = $this->pages - $count + 1;
			}
			// 开始循环拼接页码链接
			for($i = 0; $i < $count; $i++){
				$str = "<a href = {$this->url}page={$num}>{$num}</a>";
				// 如果是当前页，则只显示数字，不加超链接
				if($num == $this->cpage) $str = $num;
				$list = $list.$str;
				// 排队最后一个，中间都加两个空格隔开
				if ($i < $count - 1) $list .= "   ";
				$num++;
			}
			return $list;
		}
		// 下一页 末页
		private function last(){
			$next_num = $this->cpage + 1;
			// 下一页链接，即为当前页加1
			$next_str = "<a href={$this->url}page={$next_num}>下一页</a>";
			// 末尾页取总页码数加链接
			$end_str = "<a href={$this->url}page={$this->pages}>末页</a>";
			// 如果当前为最后一页，则不显示
			return ($this->cpage < $this->pages) ? $next_str." ".$end_str : NULL;
		}
	}