page.class.php

<?php

class MyPageUrl{

	private $totalNum;
	private $perpageNum;		//每页显示条数	
	private $pageNow;			//当前页页码
	private $url;				//当前url

	
	//页码显示
	private $pageStyle; //页码样式，提供2种样式

	private $prePage;		//页码前偏移量
	private $floPage;		//页码后偏移量

	private $skipStyle;		//手动跳转，0为手动输入页码，1为下拉菜单选择页码

	private $page_act;		//翻页样式 0:url 1:ajax

	//页码文字
	//style2&style3
	private $firstFonts = "首页";
	private $lastFonts = "末页";

	private $nextFonts = "下一页 >";		
	private $preFonts = "< 上一页";

	//前n页，后n页
	private $page_n;
	private $pn = 10;
	private $pn_fonts = "前10页";
	private $fn = 10;
	private $fn_fonts = "后10页";

	//展现的页码
	private $pageShow;

	//构造函数
	function __construct($totalNum,$perpageNum,$prePage,$preFonts,$floPage,$nextFonts,$p,$skipStyle,$pageStyle,$page_n,$page_act){
	
		$this->totalNum = $totalNum;
		$this->perpageNum = $perpageNum;
		$this->prePage = $prePage;
		$this->floPage = $floPage;
		$this->skipStyle = $skipStyle;
		$this->pageStyle = $pageStyle;
		$this->page_n = $page_n;
		$this->page_act = $page_act;

		$this->getPageNow($p);

		$this->totalPage = $this->getTotalPage(); //总页数

		$this->pageShow = "";
		$this->getUrl();
	}
			

	/************定义__toString方法,把对象解析成字符串******/
	public function __toString(){
	
		return $this->pageShow;
	}

	/************获得当前页页码,$p用来接收$_GET['p']*******/
	public function getPageNow($p){
	
		if(!isset($p)){
			
			$this->pageNow = 1;
		}else if($p>0){
			
			$this->pageNow = $p;	
		}else{
		
			die("page number error");
		}

		return $this->pageNow;
	}



    /***********************设置当前页面链接***************/
    public function getUrl(){

        $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
		
		//判断是否带参数
		if(strpos($url,"?") === false){ //不带参数

			return $this->url = $url."?";
		}else{ //带参数
		
			$url = explode("?",$url);
			//参数
			$param = $url[1];

			//判断是否有多个参数
			if(strpos($param,"&") === false){ //只有一个参数
	
				//判断参数是否为p
				if(strpos($param,"p=") === false){ //不含参数p
				
					//合并url
					$url = implode("?",$url);	

					return $this->url = $url."&";

				}else{
				
					//把参数p去掉
					$url = $url[0];

					return $this->url = $url."?";
				}
				
			}else{ //多个参数
			
				$param = explode("&",$param);

				//遍历参数数组
				foreach($param as $k=>$v){

					if(strpos($v,"p=") === false){
						
						continue;
					}else{
			
						//当含有参数p时，把它从数组中删除
						unset($param[$k]);
					}
				}

					//删除参数p之后组合数组
					$param = implode("&",$param);
					$url[1] = $param;
					$url = implode("?",$url);

					return $this->url = $url."&";
			}
		}
	}

	/************************前偏移量处理********************/
	public function preOffset($preFonts){
	

		//前偏移量的处理
		if($this->pageNow!=1 && ($this->pageNow - $this->prePage -1 <= 1)){
					
			//上一页
			$this->pageShow .= "<a id=\"pre_page\" class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow-1)."\">".($preFonts == ""?$this->preFonts:$preFonts)."</a>";

			
			//页码
			for($i=1;$i<=$this->pageNow-1;$i++){		

				//ajax方式不显示
				if($this->page_act != 1){

					$this->pageShow .= "<a class=\"pagenum\" href=\"".$this->url."p=".$i."\">".$i."</a>";	
				}
			}

		}else if($this->pageNow - $this->prePage -1 > 1){ //pageNow至少大于2时才会出现"1..."
			
			//样式2.加上'首页'
			if($this->pageStyle == 2 || $this->page_act == 1){
				
				//首页
				$this->pageShow .= "<a id=\"first_page\" class=\"pagenum\" href=\"".$this->url."p=1\">".$this->firstFonts."</a>";

				//style2.前n页
				if($this->page_n == 1 && $this->page_act != 1){
				
					if($this->pageNow>$this->pn){
					
						$this->pageShow .= "<a id=\"pre_n_page\" class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow-$this->pn)."\">".$this->pn_fonts."</a>";
					}
				}
			}
			
			
			//上一页
			$this->pageShow .= "<a id=\"pre_page\" class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow-1)."\">".($preFonts == ""?$this->preFonts:$preFonts)."</a>";
			
			//样式1.加上第一页'1'、'...'
			if($this->pageStyle == 1){
				$this->pageShow .=  "<a class=\"pagenum\" href=\"".$this->url."\">1</a><a id=\"pre_page_2\" class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow-$this->prePage-1)." \" title=\"第".($this->pageNow-$this->prePage-1)."页\">…</a>";
			}

			for($i=$this->prePage;$i>=1;$i--){		

				//当前页和'...'之间的页码，ajax方式不显示
				if($this->page_act != 1){

					$this->pageShow .= "<a class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow-$i)."\">".($this->pageNow-$i)."</a>";	
				}
			}
		}
	}

	/**********************页码和后偏移量处理***************************/
	public function floOffset($nextFonts){
	
		if($this->totalPage > $this->floPage){ //总页数大于后偏移量时

			for($i=0;$i<=$this->floPage;$i++){
			
				$page = $this->pageNow+$i;
				
				if($page<=$this->totalPage){

					//页码,ajax方式不显示
					if($this->page_act != 1){

						$this->pageShow .= "<a class=\"pagenum\" href=\"".$this->url."p=".$page."\">".$page."</a>";
					}
				}
			}

			if($this->pageNow < $this->totalPage){

				
				//当前页+后偏移量+1小于总页数时出现"..."
				if(($this->pageNow+$this->floPage+1)<$this->totalPage){
			
					//样式1.显示'...'
					if($this->pageStyle == 1){
						$this->pageShow .= "<a id=\"flo_page_2\" class=\"pagenum\" href=\"".$this->url."p=".($page+1)."\" title=\"第".($page+1)."页\">…</a>";
					}
				}
				
				
				//当前页+后偏移量+1小于等于总页数时出现最后一页的快捷标签
				if(($this->pageNow+$this->floPage+1)<=$this->totalPage){
				
					//最后一页
					//样式1.始终出现'最后一页页码'
					if($this->pageStyle == 1){
						$this->pageShow .= "<a id=\"flo_page\" class=\"pagenum\" href=\"".$this->url."p=".$this->totalPage."\" title=\"总共".$this->totalPage."页\">".$this->totalPage."</a>";
					}
				}						

				$this->pageShow .= "<a id=\"flo_page\" class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow+1)."\">".($nextFonts == ""?$this->nextFonts:$nextFonts)."</a>"; //当实例化对象时用户传递的文字为空时则调用类预设的"下一页",否则输出用户传递的值

				//style2.加上后n页
				if($this->pageStyle == 2 && $this->page_n == 1 && $this->page_act != 1){
				
					if(($this->pageNow+10)<$this->totalPage){
					
						$this->pageShow .= "<a id=\"flo_n_page\" class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow+$this->fn)."\">".$this->fn_fonts."</a>";
					}
				}

				//显示'末页'
				if($this->pageStyle == 2){
				
					if(($this->pageNow+$this->floPage+1)<$this->totalPage){

						$this->pageShow .= "<a id=\"last_page\" class=\"pagenum\" href=\"".$this->url."p=".$this->totalPage."\">末页</a>";
					}
				}

			}else if($this->pageNow > $this->totalPage && $this->totalPage != 0){
			
				die("超出页码范围");
			}else if($this->totalPage == 0){
			
				echo "还没有文章";
				exit();
			}
		}else{ //总页数小于后偏移量时
			
			if($this->pageNow < $this->totalPage){  //当前页小于总页数时

				for($i=0;$i<$this->totalPage;$i++){
			
					$page = $this->pageNow+$i;
					
					if($page < $this->totalPage){
					
						if($this->page_act != 1){

							//页码后边界
							$this->pageShow .= "<a id=\"flo_page\" class=\"pagenum\" href=\"".$this->url."p=".$page."\">".$page."</a>";
						}

					}else if($page == $this->totalPage){
					
						if($this->page_act != 1){

							$this->pageShow .= "<a id=\"flo_page\" class=\"pagenum\" href=\"".$this->url."p=".$page."\">".$page."</a>";
						}
					}else if($this->pageNow > $this->totalPage && $this->totalPage != 0){
			
						die("超出页码范围");
					}else if($this->totalPage == 0){
			
						echo "还没有文章";
						exit();
					}
				}

				$this->pageShow .= "<a id=\"flo_page\" class=\"pagenum\" href=\"".$this->url."p=".($this->pageNow+1)."\">".$this->nextFonts."</a>";
			}else if($this->pageNow > $this->totalPage && $this->totalPage != 0){
			
				die("超出页码范围");
			}else if($this->totalPage == 0){
			
				echo "还没有文章";
				exit();
			}else{ //当前页等于总页数
			
				if($this->page_act != 1){

					$this->pageShow .= "<a id=\"flo_page\" class=\"pagenum\" href=\"".$this->url."p=".$this->totalPage."\">".$this->totalPage."</a>";
				}
			}
		}
	}

	/********************其它页面信息***********************/
	public function getOtherInfo(){
	
		//ajax方式不显示手动跳转信息
		if($this->page_act != 1){

			$this->pageShow .= "&nbsp;跳转至 ";

			//跳转类型
			if($this->skipStyle =="" ){ //不加跳转
		
				$this->pageShow .= "";
			}else if($this->skipStyle == 1){ //输入框
		
				$this->pageShow .= "<input id=\"skip\" type=\"text\" value=\"".$this->pageNow."\">";
		
				$this->pageShow .= "<button id=\"go\">GO</button>";
			}else if($this->skipStyle == 2){ //下拉菜单
		
				//选择下拉菜单自动跳转
				$this->pageShow .= "<select id=\"select_page\" onchange=\"location.href=this.options[this.selectedIndex].value;\" >";
			
				for($i=1;$i<=$this->totalPage;$i++){
			
					$this->pageShow .= "<option value=\"".$this->url."p=".$i."\"";  
				
					//下拉菜单默认显示当前页
					if($i == $this->pageNow){
				
						$this->pageShow .= " selected";
					}
				
					$this->pageShow .= ">".$i."</option>";
				}
			
				$this->pageShow .= "</select>";
			}
		}

		$this->pageShow .= "<span id=\"pagenow_info\">&nbsp;&nbsp;当前第".$this->pageNow."页</span>";
		$this->pageShow .= "/<span id=\"totalpage_info\">共".$this->totalPage."页</span>";
		$this->pageShow .= "&nbsp;<span id=\"totalNum_info\">共".$this->totalNum."条</span>";
	}

   
	/*****************获取每页第一条信息*****************/
	public function getFirstRow(){
	
		$firstRow = $this->perpageNum * ($this->pageNow-1) + 1;//当前页第一条是总条数中第几条

		return $firstRow;
	}
	
	/********************获得总页数***********************/
	public function getTotalPage(){
	
		$totalPage = ceil($this->totalNum / $this->perpageNum);
		return $totalPage;
	}

	/* ****************获取上一页、下一页文字*************** */

	public function getPreFonts($preFonts){
	
			return ($preFonts=="")?$this->preFonts:$preFonts;
	}
	
	public function getNextFonts($nextFonts){
	
			return ($nextFonts=="")?$this->nextFonts:$nextFonts;
	} 

}