Unable to obtain ID in the background

Question

The hui-admin used in the background cannot get the Id no matter how I submit it

Answer 1

Thank you for your reply, this is how I received it.

Answer 2

Isn’t the pid you are passing here? After the function is called, how do you get it in the background? Directly use PHP's native magic constant $_POST to print out all the values ​​​​passed in the post