1 <?php  2     header("Content-Type:text/html;charset=utf-8"); 3     //mysqli操作数据库 4     //1.创建对象 5     $mysqli  = new  mysqli ("localhost","root","","test"); 6     //验证连接是否成功 7     if (!$mysqli){ 8         # code... 9         die("连接失败".$mysqli->connect_error);10     }11     //2.操作数据库12     $sql = "select * from user";13     $res = $mysqli->query($sql);14     // var_dump($res);15     //3.处理结果16     if ($res) {17         # code...18         //fetch_row()记得加上()19         while ($row = $res->fetch_row()) {20             # code...21             foreach ($row as $key => $value) {22                 # code...23                 echo "$value--";24             }25             echo "<br />";26         }27     }else{28         echo "失败";29     }30     //4.关闭资源31     $res->free();32     $mysqli->close();33  ?>