数组中的stdClass Object如何访问

Question

使用print_r($data)输出结果为Array
(
    [0] => stdClass Object
        (
            [color_item_no] => 1
            [color_name] => sdf
            [size_item_no] => 1
            [size] => S
            [jar_no] => 45
            [qty] => 45
            [stand_wgt] => 
            [qty_unit] => 1
        )    [1] => stdClass Object
        (
            [color_item_no] => 1
            [color_name] => sdf
            [size_item_no] => 2
            [size] => M
            [jar_no] => 45
            [qty] => 45
            [stand_wgt] => 
            [qty_unit] => 1
        )    [2] => stdClass Object
        (
            [color_item_no] => 1
            [color_name] => sdf
            [size_item_no] => 3
            [size] => L
            [jar_no] => 45
            [qty] => 4
            [stand_wgt] => 
            [qty_unit] => 1
        ))我使用
echo $data[0]['size']
提示错误，不然该怎么访问呢？

Answer 1

顺便问一下，那该如何添加一个字段到这个数组中？？
Array 
( 
    [0] => stdClass Object 
        ( 
            [color_item_no] => 1 
            [color_name] => sdf 
            [size_item_no] => 1 
            [size] => S 
            [jar_no] => 45 
            [qty] => 45 
            [stand_wgt] => 
            [qty_unit] => 1 
            [id] => 123 
        ) 
) 
像上面那样

Answer 2

$obj=new stdClass();
$obj>size=111;//可以赋其他值值
$a[]=$obj;

Answer 3

实在太感谢了...
刚学PHP，PHP的数组和别的语言不大一样...实在搞得头痛...