Foreach未定义索引

Question

我试图使用print_r循环遍历数组我得到了下面的数组，但是我正在

  

＆＃34;注意：未定义的索引：名称＆＃34;

错误，当我运行循环时，不知道我做错了什么？ 请帮助

Array
(
[0] => Array
    (
        [0] => Array
            (
                [ID] => 1
                [name] => Paul
                [email] => 32
            )

        [1] => Array
            (
                [ID] => 2
                [name] => Allen
                [email] => 25
            )

        [2] => Array
            (
                [ID] => 3
                [name] => Teddy
                [email] => 23
            )

        [3] => Array
            (
                [ID] => 4
                [name] => 4
                [email] => Mark
            )

        [4] => Array
            (
                [ID] => 5
                [name] => Paul
                [email] => 32
            )

        [5] => Array
            (
                [ID] => 6
                [name] => Allen
                [email] => 25
            )

        [6] => Array
            (
                [ID] => 7
                [name] => Teddy
                [email] => 23
            )

        [7] => Array
            (
                [ID] => 8
                [name] => 4
                [email] => Mark
            )

        [8] => Array
            (
                [ID] => 9
                [name] => Paul
                [email] => 32
            )

        [9] => Array
            (
                [ID] => 10
                [name] => Allen
                [email] => 25
            )

        [10] => Array
            (
                [ID] => 11
                [name] => Teddy
                [email] => 23
            )

        [11] => Array
            (
                [ID] => 12
                [name] => 4
                [email] => Mark
            )

        [12] => Array
            (
                [ID] => 13
                [name] => Paul
                [email] => 32
            )

        [13] => Array
            (
                [ID] => 14
                [name] => Allen
                [email] => 25
            )

        [14] => Array
            (
                [ID] => 15
                [name] => Teddy
                [email] => 23
            )

        [15] => Array
            (
                [ID] => 16
                [name] => 4
                [email] => Mark
            )

        [16] => Array
            (
                [ID] => 17
                [name] => Paul
                [email] => ibraq22@yahooo.com
            )

        [17] => Array
            (
                [ID] => 18
                [name] => Opeyemi Adam
                [email] => resfvr@yahoo.com
            )

        [18] => Array
            (
                [ID] => 19
                [name] => Opeyemi Adam
                [email] => info@ckdigital.net
            )

        [19] => Array
            (
                [ID] => 20
                [name] => Paul
                [email] => ibraq22@yahooo.com
            )

    )

)

我的PHP循环在

之下

    foreach ($retr as $page) {
        echo $page['name'];
        //var_dump($page);
    }

此致

Answer 1

您的数组是多维数组，是一个包含另外19个子元素的单个元素数组。

如果你只想迭代子元素，那么在顶层elelemt而不是父数组上运行循环：

select      *

from        t

where       field3 <> 9999
         or not exists (select null from t t2 where t2.field1 = t.field1 and field3 <> 9999)
;