<?php
/*
 * 使用:
 * $page = new Page(連接符,查詢語句,當(dāng)前頁碼,每頁大小,頁碼符)
 * 連接符:一個MYSQL連接標(biāo)識符,如果該參數(shù)留空,則使用最近一個連接
 * 查詢語句:SQL語句
 * 當(dāng)前頁碼:指定當(dāng)前是第幾頁
 * 每頁大小:每頁顯示的記錄數(shù)
 * 頁碼符:指定當(dāng)前頁面URL格式
 *
 * 使用例子:
 * $sql = "select * from aa";
 * $page = new Page($conn,$sql,$_GET['page'],4,"?page=");
 *
 * 獲得當(dāng)前頁碼
 * $page->page;
 *
 * 獲得總頁數(shù)
 * $page->pageCount;
 *
 * 獲得總記錄數(shù)
 * $page->rowCount;
 *
 * 獲得本頁記錄數(shù)
 * $page->listSize;
 *
 * 獲得記錄集
 * $page->list;
 * 記錄集是一個2維數(shù)組,例:list[0]['id']訪問第一條記錄的id字段值.
 *
 * 獲得頁碼列表
 * $page->getPageList();
 */
class Page
{
  //基礎(chǔ)數(shù)據(jù)
  var $sql;
  var $page;
  var $pageSize;
  var $pageStr;
  //統(tǒng)計(jì)數(shù)據(jù)
  var $pageCount; //頁數(shù)
  var $rowCount; //記錄數(shù)
  //結(jié)果數(shù)據(jù)
  var $list = array(); //結(jié)果行數(shù)組
  var $listSize ;
  //構(gòu)造函數(shù)
  function Page($conn,$sql_in,$page_in,$pageSize_in,$pageStr_in)
  {
    $this->sql = $sql_in;
    $this->page = intval($page_in);
    $this->pageSize = $pageSize_in;
    $this->pageStr = $pageStr_in;
    //頁碼為空或小于1的處理
    if(!$this->page||$this->page<1)
    {
      $this->page = 1;
    }
    //查詢總記錄數(shù)
    $rowCountSql = preg_replace("/([\w\W]*?select)([\w\W]*?)(from[\w\W]*?)/i","$1 count(0) $3",$this->sql);
    if(!$conn)
      $rs = mysql_query($rowCountSql) or die("bnc.page: error on getting rowCount.");
    else
      $rs = mysql_query($rowCountSql,$conn) or die("bnc.page: error on getting rowCount.");
    $rowCountRow = mysql_fetch_row($rs);
    $this->rowCount=$rowCountRow[0];
    //計(jì)算總頁數(shù)
    if($this->rowCount%$this->pageSize==0)
      $this->pageCount = intval($this->rowCount/$this->pageSize);
    else
      $this->pageCount = intval($this->rowCount/$this->pageSize)+1;
    //SQL偏移量
    $offset = ($this->page-1)*$this->pageSize;
    if(!$conn)
      $rs = mysql_query($this->sql." limit $offset,".$this->pageSize) or die("bnc.page: error on listing.");
    else
      $rs = mysql_query($this->sql." limit $offset,".$this->pageSize,$conn) or die("bnc.page: error on listing.");
    while($row=mysql_fetch_array($rs))
    {
      $this->list[]=$row;
    }
    $this->listSize = count($this->list);
  }
  /*
   * getPageList方法生成一個較簡單的頁碼列表
   * 如果需要定制頁碼列表,可以修改這里的代碼,或者使用總頁數(shù)/總記錄數(shù)等信息進(jìn)行計(jì)算生成.
   */
  function getPageList()
  {
    $firstPage;
    $previousPage;
    $pageList;
    $nextPage;
    $lastPage;
    $currentPage;
    //如果頁碼>1則顯示首頁連接
    if($this->page>1)
    {
      $firstPage = "<a href=\"".$this->pageStr."1\">首頁</a>";
    }
    //如果頁碼>1則顯示上一頁連接
    if($this->page>1)
    {
      $previousPage = "<a href=\"".$this->pageStr.($this->page-1)."\">上一頁</a>";
    }
    //如果沒到尾頁則顯示下一頁連接
    if($this->page<$this->pageCount)
    {
      $nextPage = "<a href=\"".$this->pageStr.($this->page+1)."\">下一頁</a>";
    }
    //如果沒到尾頁則顯示尾頁連接
    if($this->page<$this->pageCount)
    {
      $lastPage = "<a href=\"".$this->pageStr.$this->pageCount."\">尾頁</a>";
    }
    //所有頁碼列表
    for($counter=1;$counter<=$this->pageCount;$counter++)
    {
      if($this->page == $counter)
      {
        $currentPage = "<b>".$counter."</b>";
      }
      else
      {
        $currentPage = " "."<a href=\"".$this->pageStr.$counter."\">".$counter."</a>"." ";
      }
      $pageList .= $currentPage;
    }
    return $firstPage." ".$previousPage." ".$pageList." ".$nextPage." ".$lastPage." ";
  }
}
?>

<?php
@$db = mysql_connect('localhost', 'root', '123456') or
    die("Could not connect to database.");//連接數(shù)據(jù)庫
mysql_query("set names 'utf8'");//輸出中文
mysql_select_db('test');    //選擇數(shù)據(jù)庫
$sql = "select * from `users`"; //一個簡單的查詢
$page = new Page('',$sql,$_GET['page'],5,"?page=");
$rows = $page->list;
foreach($rows as $row)
{
  echo $row['UserName']."<br>";
}
echo $page->getPageList(); //輸出分頁列表
?>