<?php
/*
 * PHP分页类
 * @package Page
 * @Created 2013-03-27
 * @Modify  2013-03-27
 * Example:
 $myPage=new Pager(1300,intval($CurrentPage));
 $pageStr= $myPage->GetPagerContent();
 echo $pageStr;
 */
class Pager {
	private $pageSize = 10;
	private $pageIndex;
	private $totalNum;

	private $start;

	private $totalPagesCount;

	private $pageUrl;
	private static $_instance;

	public function __construct($p_totalNum, $p_pageIndex, $p_pageSize = 10,$p_initNum=3,$p_initMaxNum=5) {
		if (! isset ( $p_totalNum ) || !isset($p_pageIndex)) {
			die ( "pager initial error" );
		}

		$this->totalNum = $p_totalNum;
		$this->pageIndex = $p_pageIndex;
		$this->pageSize = $p_pageSize;
		$this->initNum=$p_initNum;
		$this->initMaxNum=$p_initMaxNum;
		$this->totalPagesCount= ceil($p_totalNum / $p_pageSize);
		$this->pageUrl=$this->_getPageUrl();

		$this->_initPagerLegal();
	}


	/**
	 * 获取去除page部分的当前URL字符串
	 *
	 * @return String URL字符串
	 */
	private function _getPageUrl() {

		if("codecharge" == "codecharge"){
			;
		}
		$CurrentUrl = $_SERVER["REQUEST_URI"];

		$arrUrl     = parse_url($CurrentUrl);
		$urlQuery   = @$arrUrl["query"];

		if($urlQuery){
			//$preg = "/(^|&)page=".$this->pageIndex."/";
			$preg = "/(^|&)page=".$this->pageIndex."/";
			$urlQuery  = preg_replace($preg, "", $urlQuery);
			$CurrentUrl = str_replace($arrUrl["query"], $urlQuery, $CurrentUrl);
			//             echo $urlQuery;
			if($urlQuery){
				$CurrentUrl.="&page";
			}
			else $CurrentUrl.="page";

		} else {
			$CurrentUrl.="?page";
		}


		return $CurrentUrl;

	}
	/*
	 *设置页面参数合法性
	 *@return void
	 */
	private function _initPagerLegal()
	{
		if((!is_numeric($this->pageIndex)) ||  $this->pageIndex<1)
		{
			$this->pageIndex=1;
		}elseif($this->pageIndex > $this->totalPagesCount)
		{
			$this->pageIndex=$this->totalPagesCount;
		}
		$this->start = ($this->pageIndex - 1) * $this->pageSize;


	}
	//$this->pageUrl}={$i}
	//{$this->CurrentUrl}={$this->TotalPages}
	public function GetPagerContent() {
		$str = "<div class=\"Pagination\">";
		//首页 上一页
		if($this->pageIndex==1)
		{
			$str .="<a onclick =\"search()\" href='javascript:void(0)' class='tips' title='首页'>首页</a> "."\n";
			$str .="<a onclick =\"search()\" href='javascript:void(0)' class='tips' title='上一页'>上一页</a> "."\n"."\n";
		}else
		{
			$str .="<a onclick =\"search();\" href='{$this->pageUrl}=1' class='tips' title='首页'>首页</a> "."\n";
			$str .="<a onclick =\"search();\" href='{$this->pageUrl}=".($this->pageIndex-1)."' class='tips' title='上一页'>上一页</a> "."\n"."\n";
		}



		/*

		除首末后 页面分页逻辑

		*/
		//10页（含）以下
		$currnt="";
		//          echo   $this->totalPagesCount;
		if($this->totalPagesCount<=10)
		{

			for($i=1;$i<=$this->totalPagesCount;$i++)

			{
				if($i==$this->pageIndex)
				{    $currnt=" class='current'";}
				else
				{    $currnt="";    }
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i} ' {$currnt}>$i</a>"."\n" ;
			}
		}else                                //10页以上
		{   if($this->pageIndex<3)  //当前页小于3
		{
			for($i=1;$i<=3;$i++)
			{
				if($i==$this->pageIndex)
				{    $currnt=" class='current'";}
				else
				{    $currnt="";    }
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i} ' {$currnt}>$i</a>"."\n" ;
			}

			$str.="<span class=\"dot\">……</span>"."\n";

			for($i=$this->totalPagesCount-3+1;$i<=$this->totalPagesCount;$i++)//功能1
			{
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i}' >$i</a>"."\n" ;

			}
		}elseif($this->pageIndex<=5)   //   5 >= 当前页 >= 3
		{
			for($i=1;$i<=($this->pageIndex+1);$i++)
			{
				if($i==$this->pageIndex)
				{    $currnt=" class='current'";}
				else
				{    $currnt="";    }
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i} ' {$currnt}>$i</a>"."\n" ;

			}
			$str.="<span class=\"dot\">……</span>"."\n";

			for($i=$this->totalPagesCount-3+1;$i<=$this->totalPagesCount;$i++)//功能1
			{
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i}' >$i</a>"."\n" ;

			}

		}elseif(5<$this->pageIndex  &&  $this->pageIndex<=$this->totalPagesCount-5 )             //当前页大于5，同时小于总页数-5

		{

			for($i=1;$i<=3;$i++)
			{
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i}' >$i</a>"."\n" ;
			}
			$str.="<span class=\"dot\">……</span>";
			for($i=$this->pageIndex-1 ;$i<=$this->pageIndex+1 && $i<=$this->totalPagesCount-5+1;$i++)
			{
				if($i==$this->pageIndex)
				{    $currnt=" class='current'";}
				else
				{    $currnt="";    }
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i} ' {$currnt}>$i</a>"."\n" ;
			}
			$str.="<span class=\"dot\">……</span>";

			for($i=$this->totalPagesCount-3+1;$i<=$this->totalPagesCount;$i++)
			{
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i}' >$i</a>"."\n" ;

			}
		}else
		{

			for($i=1;$i<=3;$i++)
			{
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i}' >$i</a>"."\n" ;
			}
			$str.="<span class=\"dot\">……</span>"."\n";

			for($i=$this->totalPagesCount-5;$i<=$this->totalPagesCount;$i++)//功能1
			{
				if($i==$this->pageIndex)
				{    $currnt=" class='current'";}
				else
				{    $currnt="";    }
				$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$i} ' {$currnt}>$i</a>"."\n" ;

			}
		}

		}

			

			
		/*

		除首末后 页面分页逻辑结束

		*/

		//下一页 末页
		if($this->pageIndex==$this->totalPagesCount)
		{
			$str .="\n"."<a onclick =\"search();\" href='javascript:void(0)' class='tips' title='下一页'>下一页</a>"."\n" ;
			$str .="<a onclick =\"search();\" href='javascript:void(0)' class='tips' title='末页'>末页</a>"."\n";


		}else
		{
			$str .="\n"."<a onclick =\"search();\" href='{$this->pageUrl}=".($this->pageIndex+1)."' class='tips' title='下一页'>下一页</a> "."\n";
			$str .="<a onclick =\"search();\" href='{$this->pageUrl}={$this->totalPagesCount}' class='tips' title='末页'>末页</a> "."\n" ;
		}

		$str .= "</div>";
		return $str;
	}

	//获得其实位置
	public function getStart() {
		return $this->start;
	}


	/**
	 * 获得实例
	 * @return
	 */
	//  static public function getInstance() {
	//      if (is_null ( self::$_instance )) {
	//          self::$_instance = new pager ();
	//      }
	//      return self::$_instance;
	//  }


}
?>