Convert single level array that uses "dot" notation into nested array (opposite to array_dot)

helpers.php

<?php

/**
 * Do an opposite of what array_dot does
 *
 * @param array $array
 * @param string $delimiter
 * @return array "undotted" nested array
 */
function array_undot(array $array, $delimiter = '.')
{
    $return = [];

    foreach ($array as $path => $value) {

        if (stripos($path, $delimiter) === false) {
            $return[$path] = $value;
            continue;
        }

        $namespaces = $value;

        foreach (array_reverse(explode($delimiter, $path)) as $key) {
            $namespaces = [$key => $namespaces];
        }

        $return = array_merge_recursive($return, $namespaces);
    }

    return $return;
}