PHP 自制分页类

思路：

通过给页面url传递get参数，来控制每页的sql查询（mysql关键词：limit），实现分页查询

代码：

 class getpage{

     public $pagenum;
     public $pagecontents;
     public $sql;
     public $url;
     public function __construct($a){

         $this->pagecontents = $a;
         $this->url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
     }
     //获取分页数
     public function createpage($sql){

         $this->sql = $sql;
         $conn = mysql_connect('localhost','root','root');
         if(!$conn){

             die(mysql_error());
         }
         mysql_select_db('class',$conn)or die(mysql_error());
         mysql_query("set names 'utf8'");
         $handle = mysql_query($sql);
         $row = array();
         while($r = mysql_fetch_row($handle)){

             $row[] = $r;
         }
         //假如除的结果为小数，则进1来保证分页数量
         $pagenum = count($row)/$this->pagecontents;
         $this->pagenum = ceil($pagenum);

     }
     //替换page参数
     private function replacestr(){
         if(isset($_GET['page'])){
             return str_replace("?page=".@$_GET['page'],"", $this->url);
         }else{
             @$_GET['page'] = 0;
         }
     }
     //页面分页显示
     public function createstyle(){

         for($i=0;$i<$this->pagenum;$i++){

             echo "<button><a href='".$this->replacestr($this->url)."?page=".$i*$this->pagecontents."'>".(1+$i)."</a></button>";
         }
     }
     public function getdata(){

         $where = " limit ".(@$_GET['page']).",".$this->pagecontents;
         $this->sql .= $where;
         $handle = mysql_query($this->sql);
         $arr = array();
         while($r = mysql_fetch_assoc($handle)){
             $arr[] = $r;
         }
         return $arr;
     }

 }