PHP join_array function

php-join_array.php

<?php

function join_array(array $array, $divider = '.') {
    $iterator = new RecursiveArrayIterator($array);
    $new_array = [];

    $recursive = function (RecursiveArrayIterator $iterator, $parent = null) use (&$recursive, &$new_array, $divider) {
        while ($iterator->valid()) {
            $path = !is_null($parent) ? $parent . $divider . $iterator->key() : $iterator->key();
            if ($iterator->hasChildren()) {
                $recursive($iterator->getChildren(), $path);
            } else {
                $new_array[$path] = $iterator->current();
            }
            $iterator->next();
        }
    }; $recursive($iterator);

    return $new_array;
}