How to convert an array of strings to an array of numbers?

Question

PHP

Good day!

There is an array from POST

<input type="checkbox" name="answer[$id][]" value="$id_2">

The array is a string:

array(1) {
  [56]=>
  array(2) {
    [0]=>
    string(3) "197"
    [1]=>
    string(3) "200"
  }
}

Did it like this:

$answer = $_POST['answer'];
$answer = array_map('intval', $answer);

For some reason it outputs:

array(1) {
  [56]=>
  int(1)
}

For array_map I tried to insert $_POST itself. The same conclusion.

Also, I tried to write to the value of the checkbox, intval($id_2) , but it still writes to the deadline.

Thanks in advance!

Answer 1

For some reason it comes out...

Because you have an array within an array, [56 => ['197', '200']]. Here you are in the map and get intval(['197', '200']).

Answer 2

array_walk_recursive _