The multidimensional array constructed by the HTML page cannot get the value on the server side

The project uses thinkphp, the front-end framework with DWZ, the page constructs a two-dimensional array, as follows:

After submitting, print Noticetype This array, the result is:
Array
(

[9353] => Array    (        ['msg'] => msg    )[9784] => Array    (        ['wechat'] => wechat    )[10113] => Array    (        ['email'] => email    )

)

However, when using a loop to iterate over the above array, or output:
"$_post\[noticetype\]\[9784\][\ ' wechat\" this format
Instead of using a two-dimensional array for post?
Why can I print a complete two-dimensional array and not get a single value?

Reply content:

The project uses thinkphp, the front-end framework with DWZ, the page constructs a two-dimensional array, as follows:

After submitting, print Noticetype This array, the result is:
Array
(

[9353] => Array    (        ['msg'] => msg    )[9784] => Array    (        ['wechat'] => wechat    )[10113] => Array    (        ['email'] => email    )

)

However, when using a loop to iterate over the above array, or output:
"$_post\[noticetype\]\[9784\][\ ' wechat\" this format
Instead of using a two-dimensional array for post?
Why can I print a complete two-dimensional array and not get a single value?

Use your given data to simulate the problem of adding quotes to the values in the array when you submit the table.
I'll show you what I wrote with your data:

  
   ";    print_r($_POST);    echo "

"; echo "-----------------------------------------------"."

"; echo $_POST['noticetype'][9353]['msg']."
"; echo $_POST['noticetype'][9784]['email']."
"; echo $_POST['noticetype'][10113]['wechat']."
"; echo "---------------------------------------------"."

"; foreach ($_POST['noticetype'] as $key => $value) { foreach ($value as $k => $v) { echo $v.'
'; } }} ?> index

Results show:

If you enclose the MSG in quotation marks , the Foreach loop can fetch the value but $_POST['noticetype'][9353]['msg'] not the value.

