php实现一个分页类

文件名：page.class.php

代码级解析

<?php class Page {		private $total; //数据表中总记录数		private $listRows; //每页显示行数		private $limit;		private $uri;		private $pageNum; //页数		private $config=array('header'=>"个记录", "prev"=>"上一页", "next"=>"下一页", "first"=>"首 页", "last"=>"尾 页");		private $listNum=8;		/*		 * $total 		 * $listRows		 */		public function __construct($total, $listRows=10, $pa=""){			$this->total=$total;			$this->listRows=$listRows;			$this->uri=$this->getUri($pa);			$this->page=!empty($_GET["page"]) ? $_GET["page"] : 1;			$this->pageNum=ceil($this->total/$this->listRows);			$this->limit=$this->setLimit();		}		private function setLimit(){			return "Limit ".($this->page-1)*$this->listRows.", {$this->listRows}";		}		private function getUri($pa){			$url=$_SERVER["REQUEST_URI"].(strpos($_SERVER["REQUEST_URI"], '?')?'':"?").$pa;			$parse=parse_url($url);					if(isset($parse["query"])){				parse_str($parse['query'],$params);				unset($params["page"]);				$url=$parse['path'].'?'.http_build_query($params);							}			return $url;		}		function __get($args){			if($args=="limit")				return $this->limit;			else				return null;		}		private function start(){			if($this->total==0)				return 0;			else				return ($this->page-1)*$this->listRows+1;		}		private function end(){			return min($this->page*$this->listRows,$this->total);		}		private function first(){			if($this->page==1)				$html.='';			else				$html.="  <a href="%7B%24this->uri%7D&page=1">{$this->config["first"]}</a>  ";			return $html;		}		private function prev(){			if($this->page==1)				$html.='';			else				$html.="  <a href="%7B%24this->uri%7D&page=%22.(%24this->page-1).%22">{$this->config["prev"]}</a>  ";			return $html;		}		private function pageList(){			$linkPage="";						$inum=floor($this->listNum/2);					for($i=$inum; $i>=1; $i--){				$page=$this->page-$i;				if($pageuri}&page={$page}'>{$page} ";			}					$linkPage.=" {$this->page} ";						for($i=1; $ipage+$i;				if($pagepageNum)					$linkPage.=" <a href="%7B%24this->uri%7D&page=%7B%24page%7D">{$page}</a> ";				else					break;			}			return $linkPage;		}		private function next(){			if($this->page==$this->pageNum)				$html.='';			else				$html.="  <a href="%7B%24this->uri%7D&page=%22.(%24this->page+1).%22">{$this->config["next"]}</a>  ";			return $html;		}		private function last(){			if($this->page==$this->pageNum)				$html.='';			else				$html.="  <a href="%7B%24this->uri%7D&page=%22.(%24this->pageNum).%22">{$this->config["last"]}</a>  ";			return $html;		}		private function goPage(){			return '  <input type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>'.$this->pageNum.')?'.$this->pageNum.':this.value;location=\''.$this->uri.'&page=\'+page+\'\'}" value="'.$this->page.'" style="width:25px"><input type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>'.$this->pageNum.')?'.$this->pageNum.':this.previousSibling.value;location=\''.$this->uri.'&page=\'+page+\'\'">  ';		}		function fpage($display=array(0,1,2,3,4,5,6,7,8)){			$html[0]="  共有<b>{$this->total}</b>{$this->config["header"]}  ";			$html[1]="  每页显示<b>".($this->end()-$this->start()+1)."</b>条，本页<b>{$this->start()}-{$this->end()}</b>条  ";			$html[2]="  <b>{$this->page}/{$this->pageNum}</b>页  ";						$html[3]=$this->first();			$html[4]=$this->prev();			$html[5]=$this->pageList();			$html[6]=$this->next();			$html[7]=$this->last();			$html[8]=$this->goPage();			$fpage='';			foreach($display as $index){				$fpage.=$html[$index];			}			return $fpage;		}		}