php分页类 可直接调用

<?php
/**
 * 分页类
 * @author xyy
 *  调用分页实例
    $subPages=new SubPages(数据总条数);//实例化分页类
 *  //$subPages->setEachDisNums(50);//设置每页显示多少条(可选)
    $limit = $subPages->getLimit();//生成用于sql的limit参数格式: 0,20
    $show_pages = $subPages->show_SubPages();//显示分页
 */
class SubPages{ 
      
    private  $each_disNums = 20;//每页显示的条目数 
    private  $nums;//总条目数 
    private  $current_page = 1;//当前被选中的页 
    private  $sub_pages = 10;//每次显示的页数 
    private  $pageNums;//总页数 
    private  $page_array = array();//用来构造分页的数组 
    private  $subPage_link;//每个分页的链接 
    private  $subPage_type;//显示分页的类型 
    /*
    __construct是SubPages的构造函数,用来在创建类的时候自动运行.
    @$each_disNums   每页显示的条目数
    @nums     总条目数
    @current_num     当前被选中的页
    @sub_pages       每次显示的页数
    @subPage_link    每个分页的链接
    @subPage_type    显示分页的类型
 
    当@subPage_type=1的时候为普通分页模式
         example:   共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
         当@subPage_type=2的时候为经典分页样式
         example:   当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
    */
   public function __construct($nums,$subPage_type = 2){
        $this->nums=intval($nums); 
        if(isset($_GET["p"])){ 
            $this->current_page=intval($_GET["p"]);   
        }
        $this->pageNums=ceil($nums/$this->each_disNums); 
        $this->subPage_link=$this->GetUri();
    }
    /**
     * __destruct析构函数,当类不在使用的时候调用,该函数用来释放资源。
     */
    public function __destruct(){ 
        unset($each_disNums); 
        unset($nums); 
        unset($current_page); 
        unset($sub_pages); 
        unset($pageNums); 
        unset($page_array); 
        unset($subPage_link); 
        unset($subPage_type); 
    }
    /**
     * 获取request_uri
     * @return type
     */
    protected function GetUri()
    {
        $uri = $_SERVER['REQUEST_URI'];
        if(strstr($uri, '?p=') || strstr($uri, '&p=')) return preg_replace('/(\?|&)p=\d+/', '$1p=', $uri);
        if(strstr($uri, '?')) return $uri.'&p=';
        if(strstr($uri, '&')) return $uri.'?p=';
        return $uri.'?p=';
    }
    /**
     * 获取limit
     * @return type
     */
    public function getLimit()
    {
        $start_num = ($this->current_page - 1) * $this->each_disNums;
        return "{$start_num},{$this->each_disNums}";
    }
    /**
     * setEachDisNums 设置每页的显示的个数
     * @param type $each_disNums
     */
    public function setEachDisNums($each_disNums){
        $this->each_disNums = intval($each_disNums);
        $this->pageNums=ceil($this->nums/$this->each_disNums); 
    }
    /**
     * show_SubPages函数用在构造函数里面。而且用来判断显示什么样子的分页  
     * @param type $subPage_type
     * @return type
     */
    public function show_SubPages($subPage_type = 2){ 
        if($subPage_type == 1){ 
            return $this->subPageCss1(); 
        }elseif ($subPage_type == 2){ 
            return $this->subPageCss2(); 
        } 
    } 
    /**
     * 用来给建立分页的数组初始化的函数。
     * @return type
     */
    protected function initArray(){ 
        for($i=0;$i<$this->sub_pages;$i++){ 
            $this->page_array[$i]=$i; 
        } 
        return $this->page_array; 
    } 
    /**
     * construct_num_Page该函数使用来构造显示的条目
     * 即使:[1][2][3][4][5][6][7][8][9][10]
     * @return type
     */
    protected function construct_num_Page(){ 
        if($this->pageNums < $this->sub_pages){ 
            $current_array=array(); 
            for($i=0;$i<$this->pageNums;$i++){  
                $current_array[$i]=$i+1; 
            } 
        }else{ 
            $current_array=$this->initArray(); 
            if($this->current_page <= 3){ 
                for($i=0;$i<count($current_array);$i++){ 
                    $current_array[$i]=$i+1; 
                } 
            }elseif ($this->current_page <= $this->pageNums && $this->current_page > $this->pageNums - $this->sub_pages + 1 ){ 
                for($i=0;$i<count($current_array);$i++){ 
                    $current_array[$i]=($this->pageNums)-($this->sub_pages)+1+$i; 
                } 
            }else{ 
                for($i=0;$i<count($current_array);$i++){ 
                    $current_array[$i]=$this->current_page-2+$i; 
                } 
            } 
        } 
 
        return $current_array; 
    } 
    /**
     * 构造普通模式的分页
     * 共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
     * @return string
     */
    protected function subPageCss1(){ 
        $subPageCss1Str=""; 
        $subPageCss1Str.="共".$this->nums."条记录,"; 
        $subPageCss1Str.="每页显示".$this->each_disNums."条,"; 
        $subPageCss1Str.="当前第".$this->current_page."/".$this->pageNums."页 "; 
        if($this->current_page > 1){ 
            $firstPageUrl=$this->subPage_link."1"; 
            $prewPageUrl=$this->subPage_link.($this->current_page-1); 
            $subPageCss1Str.="[<a href='$firstPageUrl'>首页</a>] "; 
            $subPageCss1Str.="[<a href='$prewPageUrl'>上一页</a>] "; 
        }else { 
            $subPageCss1Str.="[首页] "; 
            $subPageCss1Str.="[上一页] "; 
        } 
           
        if($this->current_page < $this->pageNums){ 
            $lastPageUrl=$this->subPage_link.$this->pageNums; 
            $nextPageUrl=$this->subPage_link.($this->current_page+1); 
            $subPageCss1Str.=" [<a href='$nextPageUrl'>下一页</a>] "; 
            $subPageCss1Str.="[<a href='$lastPageUrl'>尾页</a>] "; 
        }else { 
            $subPageCss1Str.="[下一页] "; 
            $subPageCss1Str.="[尾页] "; 
        } 
           
        //echo $subPageCss1Str; 
        return $subPageCss1Str; 
       
    }
    /**
     * 构造经典模式的分页
     * 当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
     * @return string
     */
    protected function subPageCss2(){ 
        $subPageCss2Str=""; 
        $subPageCss2Str.="当前第".$this->current_page."/".$this->pageNums."页 "; 
 
        if($this->current_page > 1){ 
            $firstPageUrl=$this->subPage_link."1"; 
            $prewPageUrl=$this->subPage_link.($this->current_page-1); 
            $subPageCss2Str.="[<a href='$firstPageUrl'>首页</a>] "; 
            $subPageCss2Str.="[<a href='$prewPageUrl'>上一页</a>] "; 
        }else { 
            $subPageCss2Str.="[首页] "; 
            $subPageCss2Str.="[上一页] "; 
        } 
 
        $a=$this->construct_num_Page(); 
        for($i=0;$i<count($a);$i++){ 
            $s=$a[$i]; 
            if($s == $this->current_page ){ 
                $subPageCss2Str.="[<span style='color:red;font-weight:bold;'>".$s."</span>]"; 
            }else{ 
                $url=$this->subPage_link.$s; 
                $subPageCss2Str.="[<a href='$url'>".$s."</a>]"; 
            } 
        } 
 
        if($this->current_page < $this->pageNums){ 
            $lastPageUrl=$this->subPage_link.$this->pageNums; 
            $nextPageUrl=$this->subPage_link.($this->current_page+1); 
            $subPageCss2Str.=" [<a href='$nextPageUrl'>下一页</a>] "; 
            $subPageCss2Str.="[<a href='$lastPageUrl'>尾页</a>] "; 
        }else { 
            $subPageCss2Str.="[下一页] "; 
            $subPageCss2Str.="[尾页] "; 
        } 
        return $subPageCss2Str; 
    } 
}

  

posted @ 2016-10-12 18:15  xyyphp  阅读(482)  评论(0编辑  收藏  举报