两个浅显易懂的分页类

<?php
class page{
 /*
  类功能：分页
  创建时间：2005-03-12
  作者：多菜鸟
  EMAIL：kingerq AT sohu.com
  来源：http://blog.csdn.net/kingerq
  
  实例：
  //省略一些连接信息及mysql类库等包含文件
  $sql = "select count(*) from t_publiccode";
  $db->query($sql);
  $db->next_record();
  $recordcount = $db->f(0);//记录总数
  
  $p = new page($recordcount, 20, 15);//(总记录数，每页记录数，每面页码个数)
  $p->ar = array("«首页", "‹前页", "后页›", "末页»");//可以设置成图片HTML代码
  $trunpage = $p->show_page();//得到分页信息
  
  $sql = "select * from t_publiccode".$p->limit();
  
  //echo $trunpage."<br>".$sql;
  $db->query($sql);
  //...
  
  类似效果：
  共[52600]条记录/共[2630]页 <<首页 <前页 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 后页> 末页>>
  */
 var $pagecount;         //总页数
 
 var $limit = "";        //分页时用到的limit参数
 
 var $pagearg = "page";  //分页参数名称
 
 var $pagesize = 20;     //每页显示记录数
 
 var $recordcount;       //总记录数
 
 var $pagenum;           //当前页码
 
 var $argstr = "";       //GET参数字符串
 
 var $perpage = 5;       //每次显示页码个数
 
 var $ar = array("[«]", "[‹]", "[›]", "[»]");
 
 /*
  * 功能：构造函数
  * 参数 $recordcount 为记录总数
  * 参数 $pagesize 为每页显示记录数,默认为20
  * 参数 $perpage 为每次显示页码个数,默认为5
  */
 function page($recordcount, $pagesize = 20, $perpage = 5){
   
   $this->pagesize = $pagesize;
   
   $this->recordcount = $recordcount;
   
   $this->perpage = $perpage;
   
   $this->pagecount = ceil($recordcount/$pagesize);//总页数
   
   $this->pagenum = $this->currentpage();//当前页码
   
   $this->argstr = $this->newarg();//GET参数字符串
   
   $this->limit = " LIMIT ".($this->pagenum-1)*$pagesize.",".$pagesize;//分页时用到的limit参数
 }
 
 /*
  * 功能：取得当前页码函数
  */
 function currentpage(){
  if(isset($_GET[$this->pagearg])){
   if($_GET[$this->pagearg] <= 0) {
     $page = 1;
   }else if($_GET[$this->pagearg] > $this->pagecount){
     $page = $this->pagecount;
   }else{
     $page = $_GET[$this->pagearg];
   }
  }else {
   $page = 1;
  }
  return $page;
 }
 
 /*
  * 功能：重新整理GET参数
  */
 function newarg(){
  $str = "";
  $urlar = $_GET;
  unset($urlar[$this->pagearg]);
  if($urlar){
   foreach($urlar as $key=>$val){
    if($str == "") {
   $str = "?$key=$val";
 }else {
   $str .= "&$key=$val";
 }
   }
   $str .= "&$this->pagearg=";
  }else{
   $str = "?$this->pagearg=";
  }
  return $str;
 }
 
 /* 
  * 功能：返回MYSQL语句的limit部分代码
  */
 function limit(){
  return $this->limit;
 }
 /*
  * 功能：分页字符输出函数
  */
 function show_page(){
  $trunpage = " 共[".$this->recordcount."]条记录/共[".$this->pagecount."]页 ";
  $page = $this->pagenum;
  
  //向前翻
  if($page == 1){
   $trunpage .= $this->ar[0]." ".$this->ar[1]." ";
  }else {
   $trunpage .= '<a href="'.$this->argstr.'1" target="_blank" rel="external nofollow" >'.$this->ar[0].'</a> <a _fcksavedurl=""'.$this->argstr.'1">'.$this->ar[0].'</a> <a" href="'.$this->argstr.($page-1).'" target="_blank" rel="external nofollow" >'.$this->ar[1].'</a> ';
  }
  
  //中间数字翻页
  $numpage = 1;
  while($page - $this->perpage * $numpage > 0) $numpage++;
  $startpage = ($numpage - 1) * $this->perpage;
  $endpage = $this->pagecount < $numpage * $this->perpage ? $this->pagecount : $numpage * $this->perpage;
  for($i = $startpage + 1; $i <= $endpage; $i++){
    $trunpage .= $i != $page ? "<a href=/"".$this->argstr.$i."/">$i</a> " : "<strong>".$i."</strong> ";
  }
  
  //向后翻
  if($page == $this->pagecount || $this->pagecount == 0){
   $trunpage .= $this->ar[2]." ".$this->ar[3]." ";
  }else {
   $trunpage .= '<a href="'.$this->argstr.($page+1).'" target="_blank" rel="external nofollow" >'.$this->ar[2].'</a> <a href="'.$this->argstr.$this->pagecount.'" target="_blank" rel="external nofollow" >'.$this->ar[3].'</a> ';
  }
  
  //跳转
  $select = "<select οnchange='location.href=this.options[this.selectedIndex].value'>/n";
  for($i = 1; $i <= $this->pagecount; $i++){
   $select .= "<option value=/"".$this->argstr.$i."/">$i</option>/n";
  }
  $select .= "</select>";
  return $trunpage.$select;
 }
}
?>
           

<?php
/**********************
 * 通用分页类
 * 作者: 多菜鸟
 * 邮箱: kingerq AT sohu DOT com
 * 时间: 2006-04-17
 * 来源：http://blog.csdn.net/kingerq
 * 实例:
$p = new Page( 60, 10 );
$p->trunStr = array( "First", "Prev", "Next", "End" );//设置分页显示字符
echo $p->printPage();//输出分页字符串,也可以trunUp(),trunNum(),trunDown()和jumpTo()分开来输出显示
//echo $p->limitStr();//显示MYSQL中LIMIT部分字符串
//echo $p->pageCount();//总页数
 **********************
 */
class Page {
  var $perPage       = 5;          //每页显示的页码数
  var $paramStr      = "";         //分页参数字符串变量，连接地址
  var $currentPage   = 1;          //当前页码
  var $paramName     = "pageNum";  //翻页参数名称
  var $limitStr      = "";         //MYSQL中LIMIT参数字符串
  var $pageSize      = 20;         //每页记录数
  var $trunStr       = array( "首页", "上页", "下页", "末页" ); //翻页字符
  /*
   * 构造函数
   * $recordCount 为记录总数量
   * $pageSize    为每页显示记录数
   */
  function Page( $recordCount = 0, $pageSize = 0 ) {
    if( ! is_numeric( $recordCount ) || ! is_numeric( $pageSize ) ) return;
    //记录总数
    if( intval( $recordCount ) == 0  ) 
      $recordCount = $this->recordCount;
    else 
      $this->recordCount = $recordCount;
    //每页显示记录数
    if( intval( $pageSize ) == 0  ) 
      $pageSize = $this->pageSize;
    else 
      $this->pageSize = $pageSize;
    $this->currentPage();//当前页码处理
    $this->paramStr();//当前页地址参数
    //为当前页定界
    if( $this->currentPage > $this->pageCount() ) 
      $this->currentPage = $this->pageCount() < 1 ? 1 : $this->pageCount();
  }
  function printPage() {
    $pageStr  = $this->trunUp();    //向上
    $pageStr .= $this->trunNum();   //数字页码
    $pageStr .= $this->trunDown();  //向下
    $pageStr .= $this->jumpTo();    //跳转
 
    return $pageStr;
  }
  //向上翻处理
  function trunUp() {
    $pageStr = "";
    if( $this->currentPage == 1 ) {
      $pageStr .= $this->trunStr[0] . " " . $this->trunStr[1] . " ";
    }else {
      $pageStr .= "<a href=/"".$this->paramStr."1/" title=/"".$this->trunStr[0]."/">".$this->trunStr[0]."</a> ";
      $pageStr .= "<a href=/"".$this->paramStr.($this->currentPage - 1)."/" title=/"".$this->trunStr[1]."/">".$this->trunStr[1]."</a> ";
    }
    return $pageStr;
  }
  //每页显示的页码连接
  function trunNum() {
    $pageStr = "";
    $num = 1;
    while( $this->currentPage - $this->perPage * $num > 0 ) $num++;
    $start = ( $num - 1 ) * $this->perPage;
    $end = $this->pageCount() < $this->perPage * $num ? $this->pageCount() : $this->perPage * $num;
    for( $i = $start + 1; $i <= $end; $i++ ) {
      $pageStr .= $i != $this->currentPage ? "<a href=/"".$this->paramStr."$i/">$i</a> " : "<strong>$i</strong> ";
    }
    return $pageStr;
  }
  //向下翻处理
  function trunDown() {
    $pageStr = "";
    if( $this->pageCount() == $this->currentPage || $this->pageCount() == 0 ) {
      $pageStr .= $this->trunStr[2] . " " . $this->trunStr[3] . " ";
    } else {
      $pageStr  .= "<a href=/"".$this->paramStr.($this->currentPage + 1)."/" title=/"".$this->trunStr[2]."/">".$this->trunStr[2]."</a> ";
      $pageStr .= "<a href=/"".$this->paramStr.$this->pageCount()."/" title=/"".$this->trunStr[3]."/">".$this->trunStr[3]."</a> ";
    }
    return $pageStr;
  }
  //跳转
  function jumpTo() {
    $pageStr = "<select οnchange=/"location.href=this.options[this.selectedIndex].value/">/n";
    for($i = 1; $i <= $this->pageCount(); $i++){
      if($this->currentPage == $i) $selected = " selected";
      else $selected = "";
      $pageStr .= "<option value='".$this->paramStr.$i."'$selected>$i</option>/n";
    }
    $pageStr .= "</select>";
    return $pageStr;
 }
  //当前页参数
  function paramStr() {
    unset( $_GET[$this->paramName] );//去掉翻页参数
    if( count( $_GET ) ) {
      foreach( $_GET AS $param => $value ) {
        $this->paramStr .= $this->paramStr ? "&" : "?";
        $this->paramStr .= $param . "=" . $value;
      }
      $this->paramStr .= "&".$this->paramName."=";
    } else {
      $this->paramStr = "?$this->paramName=";
    }
  }
  //取得当前页码
  function currentPage() {
    if( isset( $_GET[$this->paramName] ) && intval( $_GET[$this->paramName] ) > 0 ) {
      $this->currentPage = intval( $_GET[$this->paramName] );
    }
    return $this->currentPage;
  }
  //总页数
  function pageCount() {
    return ceil( $this->recordCount / $this->pageSize );//总页数
  }
  //MYSQL中LIMIT部分字符串
  function limitStr() {
    return " LIMIT " . ( ( $this->currentPage - 1 ) * $this->pageSize ) . ", " . $this->pageSize;
  }
  //设置每页显示页码数,页码数至少大于1
  function setPerPage($num = 5) {
    if( intval($num) > 1 )
      $this->perPage = intval($num);
  }
}
?>