Arr.php

<?php

namespace IQDEV\ElasticSearchTests\Helpers;

class Arr
{
    public static function convertingOneDimensional(array $expected, $startKey = null): array
    {
        $keys = [];
        foreach ($expected as $key => $item) {
            if ($startKey !== null) {
                $key = $startKey.'.'.$key;
            }

            if (is_array($item)) {
                $keys = array_merge($keys, static::convertingOneDimensional($item, $key));
                continue;
            }

            $keys[$key] = $item;
        }
        return $keys;
    }
}