<?php  class Page  {    protected $num;//每頁顯示條數    protected $total;//總記錄數    protected $pageCount;//總頁數    protected $current;//當前頁碼    protected $offset;//偏移量    protected $limit;//分頁頁碼    /**     * 構造方法     * @param int $total 總記錄數     * @param int $num  每頁顯示條數     */    public function __construct($total,$num=5)    {      //1.每頁顯示條數      $this->num = $num;      //2.總記錄數      $this->total = $total;      //3.總頁數      $this->pageCount = ceil($total/$num);      //4.偏移量      $this->offset = ($this->current-1)*$num;      //5.分頁頁碼      $this->limit = "{$this->offset},{$this->num}";      //6.初始化當前頁      $this->current();    }    /**     * 初始化當前頁     */    public function current(){      $this->current = isset($_GET['page'])?$_GET['page']:'1';      //判斷當前頁最大范圍      if ($this->current>$this->pageCount){        $this->current = $this->pageCount;      }      //判斷當前頁最小范圍      if ($this->current<1){        $this->current = 1;      }    }    /**     * 訪問沒權限訪問的屬性     * @param string $key 想訪問的屬性     * @return float|int|string 返回對應要改變的條件     */    public function __get($key){      if ($key == "limit") {        return $this->limit;      }      if ($key == "offset") {        return $this->offset;      }      if ($key == "current") {        return $this->current;      }    }    /**     * 處理分頁按鈕     * @return string 拼接好的分頁按鈕     */    public function show(){      //判斷初始頁碼      $_GET['page'] = isset($_GET['page'])?$_GET['page']:'1';      //將$_GET值賦給上下變量      $first = $end = $prev = $next = $_GET;      // var_dump($prev);      //上一頁      //判斷上一頁范圍      if ($this->current-1<1){        $prev['page'] = 1;      }else{        $prev['page'] = $this->current-1;      }      //下一頁      //判斷下一頁范圍      if ($this->current+1>$this->pageCount) {        $next["page"] = $this->pageCount;      }else{        $next['page'] = $this->current+1;      }      /*      首頁      $first['page'] = 1;       //尾頁      $end['page'] = $this->pageCount;      */      //拼接路徑      $url = "http://".$_SERVER["SERVER_NAME"].$_SERVER["SCRIPT_NAME"];      //拼接數組url地址欄后綴?傳入參數      //http://xxx/xxx/Page.class.php?page=值      $prev = http_build_query($prev);      $next = http_build_query($next);      // $first = http_build_query($first);      // $end = http_build_query($end);      //拼接完整路徑      $prevpath = $url."?".$prev;      $nextpath = $url."?".$next;      // $firstpath = $url."?".$first;      // $endpath = $url."?".$end;      $str = "共有{$this->total}條記錄 共有{$this->pageCount}頁 ";      $str .= "<a href='{$url}?page=1'>首頁</a> ";      $str .= "<a href='{$prevpath}'>上一頁</a> ";      $str .= "<a href='{$nextpath}'>下一頁</a> ";      $str .= "<a href='{$url}?page={$this->pageCount}'>尾頁</a> ";      return $str;    }  }  //自行調試  $a = new Page(10);  echo $a->show();?>