Using PHP's ArrayRecursiveIterator to find a key and its value in any multidimensional array.

ArrayRecursiveIterator.php

<?php

$iterator = new RecursiveIteratorIterator(
  new RecursiveArrayIterator($multidimensional_array, RecursiveArrayIterator::CHILD_ARRAYS_ONLY),
  RecursiveIteratorIterator::SELF_FIRST
);
foreach ($iterator as $key => $value) {
  if ($key === $search) {
    $your_data = $value;
    break;
  }
}