renyang9876 / yentwechat

     *

     * @return array

     */

    public static function build($array, Closure $callback)

    {

        $results = [];

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

            list($innerKey, $innerValue) = call_user_func($callback, $key, $value);

            $results[$innerKey] = $innerValue;

        }

        return $results;

    }

    /**

     * Divide an array into two arrays. One with keys and the other with values.

     *

     * @return array

     */

    public static function where($array, Closure $callback)

    {

        $filtered = [];

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

            if (call_user_func($callback, $key, $value)) {

                $filtered[$key] = $value;

            }

        }

        return $filtered;

    }

}