php示例代码之使用mysqli对象

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<?php   //连接参数   $host="localhost";   $user="root";   $pwd="111111";   $db="test";       $mysqli =new mysqli($host,$user,$pwd,$db); //实例化一个mysqli对象,并打开一个连接       if(mysqli_connect_errno()){ //检查是否可以正确打开数据库     echo "<font color='red'>unable to connect!</font>";   }       $SQL_SELECT_SYMBOLS="select * from symbols";       if($result=$mysqli->query($SQL_SELECT_SYMBOLS)){      if($result->num_rows>0){                   echo '<table cellpadding="10" border="1">';         echo '<tr><th>id</th><th>country</th><th>animal</th><th>cname</th></tr>';         while($arr=$result->fetch_array()){             echo "<tr>";             echo "<td>".$arr[0]."</td>";             echo "<td>".$arr[1]."</td>";             echo "<td>".$arr[2]."</td>";             echo "<td>".$arr[3]."</td>";             echo "</tr>";         }          echo "</table>";     }    else{     echo "记录未找到!";    }       $result->close(); //释放记录集所占用的内存   }   else{     echo "error in query:$query.".$mysqli->error;   }   $mysqli->close(); //关闭数据库连接 ?>