Question

I was wondering if it was possible to determine what position a key in an array is in relation to another key. I have a large multidimensional array and I need perform Function A when the key [E14_21] comes before [E14_20] and I need to perform a different Function B if not…

//perform Function A if:
[E14_20_0] => Array
    (
        [E14_21] => 3235
        [E14_20] => 96
    )
//Perform Function B if:
[E14_20_0] => Array
    (
        [E14_20] => 96
        [E14_21] => 3235
    )

Answer 1

You can do something like:

$keys = array_keys($E14_20_0);
if(array_search("E14_21", $keys) < array_search("E14_20", $keys)) {
  // function A
} else {
  // function B
}

You will of course need to add some sanity checks to make sure both keys exist in the array, etc.