PHP基础------mysql分页

//1.计算总记录数
               $sql_0 = "select * from t_user";
               $result_0 = mysql_query($sql_0);
               $count = mysql_num_rows($result_0);
               
               //每页显示多少条
               $pageSize = 2;
               
               //计算总页数
               $totalPage = ceil($count/$pageSize);
               
               //确定当前页
               if(isset($_GET["page"]))
               {
                   $page = $_GET["page"];
                   //限定最大页码
                   if($page>$totalPage)
                   {
                       $page = $totalPage;
                   }
                   if($page==0)
                   {
                       $page = 1;
                   }
               }
               else
               {
                   $page = 1;
               }
               
               //计算起始位置
               $start = ($page-1)*$pageSize;