How to get value of an associative HTML array in PHP using a string?

Question

Look I have a form like this:

I want t

Answer 1

You're WAY overthinking it. Anything you put in [] array notation in a form field's name will just become an array key. The following is LITERALLY all you need:

$val = $_POST['foo']['bar']['baz']['qux'];

You cannot use a string as an "address" into the array, not without insanely ugly hacks like eval, or parsing the string and doing a loop to dig into the array.