php数据库返回值有关问题

php数据库返回值问题
本人刚开始学习PHP

		$con = mysql_connect("127.0.0.1","root","root");
		if(!con){
			die('Could not connect:'.mysql_error());
		}else{
			mysql_select_db("test",$con);
			$result = mysql_query("select * from user");
			echo "

";
while($row = mysql_fetch_array($result)){
echo "";
echo "";
echo "";
echo "";
echo "";
echo "";
}
echo "

" . count($row) . "

" . $row[0] . "

" . $row[1] . "

" . $row[2] . "

";
mysql_close($con);
}
?>


我的数据库中就只有id，username，pwd3个字段为什么
echo "