<?
function array_non_empty_items($input) {
    // If it is an element, then just return it
    if (!is_array($input)) {
      return $input;
    }

    $non_empty_items = array();

    foreach ($input as $key => $value) {
      // Ignore empty cells
      if($value) {
        // Use recursion to evaluate cells
        $non_empty_items[$key] = array_non_empty_items($value);
      }
    }

    // Finally return the array without empty items
    return $non_empty_items;
  }
  
  ?>

Remove empty items from a multidimensional array in PHP

PHP