分页类及调用-PHP

<?php
class PageClass
{
private $myde_count;       //总记录数
public $myde_size;        //每页记录数
private $myde_page;        //当前页
private $myde_page_count; //总页数
private $page_url;         //页面url
private $page_i;           //起始页
private $page_ub;          //结束页
public $page_limit;
function __construct($myde_count=0,$myde_size=1,$myde_page=1,$page_url)   //构造函数,初始化
{   
   $this->myde_count=$this->numeric($myde_count);
   $this->myde_size=$this->numeric($myde_size);
   $this->myde_page=$this->numeric($myde_page);
   $this->page_limit=($this->myde_page * $this -> myde_size) - $this -> myde_size; //下一页的开始记录 
   $this->page_url=$page_url; //连接的地址 
   if($this->myde_page<1)$this->myde_page=1; //当前页小于1的时候，，值赋值为1 
   if($this->myde_count<0)$this->myde_page=0; 
   $this->myde_page_count=ceil($this->myde_count/$this->myde_size);//总页数 
   if($this->myde_page_count<1)
    $this->myde_page_count=1; 
   if($this->myde_page > $this->myde_page_count) 
     $this->myde_page = $this->myde_page_count; 
   //控制显示出来多少个页码（这个是原来的）
   //$this->page_i = $this->myde_page-2; 
   //$this->page_ub = $this->myde_page+2;
   $this->page_i = $this->myde_page; 
   $this->page_ub = $this->myde_page+5; 
   //以下这个if语句是保证显示5个页码
   if($this->page_ub > $this->myde_page_count)
   {
     $this->page_ub = $this->myde_page_count;
    $this->page_i = $this->page_ub-5;
   }
   if($this->page_i<1)$this->page_i=1;        
        if($this->page_ub>$this->myde_page_count){$this->page_ub=$this->myde_page_count; }
}
private function numeric($id) //判断是否为数字
{ 
if (strlen($id))
         {
             if (!ereg("^[0-9]+$",$id)) $id = 1;
         }
      else 
         {
             $id = 1;
         }
      return $id;
}

private function page_replace($page) //地址替换
{return str_replace("{page}", $page, $this -> page_url);}
private function myde_home() //首页
{ if($this -> myde_page != 1){ 
    return "    <span><a href=\"".$this -> page_replace(1)."\" title=\"首页\" >首页</a></span>\n";   
   }else{ 
    return "    <span>首页</span>\n";   
   }
} 
private function myde_prev() //上一页
{ if($this -> myde_page != 1){ 
    return "    <span class=\'disabled\'><a href=\"".$this -> page_replace($this->myde_page-1) ."\" title=\"上一页\" >上一页</a></span>\n";
   }else{ 
    return "    <span class=\'disabled\'>上一页</span>\n";   
   }
} 
private function myde_next() //下一页
{ 
if($this -> myde_page != $this -> myde_page_count){ 
     return "    <span class=\"page_a\"><a href=\"".$this -> page_replace($this->myde_page+1) ."\" title=\"下一页\" >下一页</a></span>\n";
   }else
     { 
    return "    <span>下一页</span>\n";   
   }
} 
private function myde_last() //尾页
{
   if($this -> myde_page != $this -> myde_page_count){ 
     return "    <span class=\"page_a\"><a href=\"".$this -> page_replace($this -> myde_page_count)."\" title=\"尾页\" >尾页</a></span>\n";
   }else{ 
     return "    <span>尾页</span>\n";   
   }
} 
function myde_write($id='page') //输出
{
   $str = "<div id=\'".$id."\' class=\'manu\'>\n"; 
   $str .= "<span>总记录:<span>".$this -> myde_count."</span></span>\n"; 
   $str .= "<span>".$this -> myde_page."</span>/<span>".$this -> myde_page_count."</span>\n"; 
   $str .= $this -> myde_home(); //调用方法，显示“首页”
   $str .= $this -> myde_prev(); //调用方法，显示“上一页”
   //以下显示1,2,3...分页
   for($page_for_i=$this->page_i;$page_for_i <= $this -> page_ub;$page_for_i++){ 
    if($this -> myde_page == $page_for_i){   
            $str .= "<span>".$page_for_i."</span>\n";    
    }   
    else{   
     $str .= "<span class='current'><a href=\"".$this -> page_replace($page_for_i)."\" title=\"第".$page_for_i."页\">";    
     $str .= $page_for_i . "</a></span>\n";    
    }
        }
   $str .= $this -> myde_next(); //调用方法，显示“下一页”
   $str .= $this -> myde_last(); //调用方法，显示“尾页”

    //以下是显示跳转页框
   $str .= "<span class=\"pages_input\"><input type=\"text\" value=\"".$this -> myde_page."\""; 
   $str .= "onmouseover=\"javascript:this.value='';this.focus();\" onkeydown=\"javascript: if(event.keyCode==13){ location='"; 
   $str .= $this -> page_replace("'+this.value+'")."';return false;}\""; 
   $str .= " title=\"输入您想要到达的页码,然后回车！\" /></span>\n"; 
   //以上是显示跳转页框
   $str .= "</div>";
   return $str;
}
function myde_write1($id='page') //输出
{
   $str = "<div id=\"".$id."\" class=\"manu\">\n <span>\n "; 
   $str .= "<span>总记录:<span>".$this -> myde_count."</span></span>\n"; 
   $str .= "<span>".$this -> myde_page."</span>/<span>".$this -> myde_page_count."</span>\n"; 
   $str .= $this -> myde_home(); //调用方法，显示“首页”
   $str .= $this -> myde_prev(); //调用方法，显示“上一页”
   //以下显示1,2,3...分页
   for($page_for_i=$this->page_i;$page_for_i <= $this->page_ub;$page_for_i++){ 
    if($this -> myde_page == $page_for_i)
{   
            $str .= "<span class=\"on\">".$page_for_i."</span>\n";    
    }   
    else{   
     $str .= "<span class=\"page_a\"><a href=\"".$this -> page_replace($page_for_i)."\" title=\"第".$page_for_i."页\">";    
     $str .= $page_for_i . "</a></span>\n";    
    }
    //以上显示1,2,3...分页
}
   $str .= $this -> myde_next(); //调用方法，显示“下一页”
   $str .= $this -> myde_last(); //调用方法，显示“尾页” 
    //以下是显示下拉式跳转页框
/*$str .="<li ><select class=\"**********\" onchange=\" javascript: location='".$this->page_replace("'+this.value+'")."';return false; \">";
    $str .="<option value=\"\"></option>";
for($i=1;$i <= $this->myde_page_count;$i++)
     {
    $str .="<option value=\"".$i."\">".$i."</option>";
     }
$str .="</select></li>\n";
   //以上是显示下拉式跳转页框
   
   //以下是显示跳转页框
  $str .= "<li class=\"pages_input\"><input type=\"text\" value=\"".$this -> myde_page."\""; 
   $str .= "onmouseover=\"javascript:this.value='';this.focus();\" onkeydown=\"javascript: if(event.keyCode==13){ location='"; 
   $str .= $this -> page_replace("'+this.value+'")."';return false;}\""; 
   $str .= "title=\"输入您想要到达的页码,然后回车！\" /></li>\n";*/
   //以上是显示跳转页框
   $str .= "</div>";
   return $str;
}
}
/*-------------------------实例--------------------------------*
$page = new PageClass(1000,5,$_GET['page'],'?page={page}');//用于动态
$page = new PageClass(1000,5,$_GET['page'],'list-{page}.html');//用于静态或者伪静态
$page -> myde_write();//显示
*/
?>





/*******************调用*******************/

$page=$_GET['page']; // 第几页；
$table='news';
$sql_n="SELECT id FROM ".$table;
$query_n=mysql_query($sql_n);
$totail=mysql_num_rows($query_n);//记录总条数
$number=8;//每页显示条数
$my_page=new PageClass($totail,$number,$page,'?page={page}');//参数设定：总记录，每页显示的条数，当前页，连接的地址
$sql="SELECT * FROM ".$table." order by riqi desc LIMIT ".$my_page->page_limit.",".$my_page->myde_size;
$query=mysql_query($sql);
while($data=mysql_fetch_assoc($query)){
    $datas[]=$data;
}