Parse and convert a multi-dimensional array into a one-dimensional array format that supports curl submission_PHP tutorial

/**
* @desc Multi-dimensional array is converted into an array that supports curl submission
* @author Script Home 2013-07-8
*/
    public function toPost(array $params = array(), $pre = '')
    {
        $result = array();
        foreach ($params as $key => $val)
        {
                if (is_array($val))
                {
                    $subPre = ($pre=="") ? $key : $pre . "[" . $key . "]";
                    //$pre = "[" . $key . "]";
                    $result = array_merge($result, toPost($val, $subPre));

                }
                else
                {
                    $result[$pre."[".$key."]"] = $val;
                }
        }

        return $result;
    }