无法从 php 数组中获取值

Question

这是我的 php 代码

 echo '<pre>';
 print_r($weekdays); echo '<br/>';

 foreach ($weekdays as $key => $day) {

     print_r($day); echo '<br/>';
     echo 'key - '. $key; echo '<br/>';
     echo 'val - '. $day['val']; die;      
 }

这是这个结果

Array
(
[sunday] => Array
    (
        ['val'] => 1
        ['from'] => 6:00:00
        ['to'] => 6:00:00
    )

[monday] => Array
    (
        ['val'] => 1
        ['from'] => 6:00:00
        ['to'] => 6:00:00
    )

[tuesday] => Array
    (
        ['from'] => 7:00:00
        ['to'] => 0:00:00
    )

[wednesday] => Array
    (
        ['from'] => 0:00:00
        ['to'] => 0:00:00
    )

[thuesday] => Array
    (
        ['from'] => 0:00:00
        ['to'] => 0:00:00
    )

[friday] => Array
    (
        ['from'] => 0:00:00
        ['to'] => 0:00:00
    )

[saturday] => Array
    (
        ['from'] => 0:00:00
        ['to'] => 0:00:00
    )
)

Array
(
['val'] => 1
['from'] => 6:00:00
['to'] => 6:00:00
)

key - sunday
val - 

问题出在我的 foreach 中，我尝试获取$day['val']但没有显示任何内容。 也尝试使用 $day->val 。 当我print_r($day)我得到

Array
(
['val'] => 1
['from'] => 6:00:00
['to'] => 6:00:00
)

请帮我。

Answer 1

问题是关键不是val它是'val' （带引号）。

echo 'val - '. $day["'val'"];

将工作。

Answer 2

看来您的密钥实际上是'val' ，而不是val 。

Answer 3

我想最好确保不要用撇号命名数组键。 这可能会使您将来或任何处理此代码的人感到困惑。

您的 print_r 应如下所示：

Array ( 
    [sunday] => Array
       (
          [val] => 1
          [from] => 6:00:00
          [to] => 6:00:00
       )

更正创建该数组的代码，您将被设置。