= [$key => $value] + $array;
        }

        return $array;
    }

    /**
     * Get a value from the array, and remove it.
     *
     * @param  array  $array
     * @param  string|int  $key
     * @param  mixed  $default
     * @return mixed
     */
    public static function pull(&$array, $key, $default = null)
    {
        $value = static::get($array, $key, $default);

        static::forget($array, $key);

        return $value;
    }

    /**
     * Convert the array into a query string.
     *
     * @param  array  $array
     * @return string
     */
    public static function query($array)
    {
        return http_build_query($array, '', '&', PHP_QUERY_RFC3986);
    }

    /**
     * Get one or a specified number of random values from an array.
     *
     * @param  array  $array
     * @param  int|null  $number
     * @param  bool|false  $preserveKeys
     * @return mixed
     *
     * @throws \InvalidArgumentException
     */
    public static function random($array, $number = null, $preserveKeys = false)
    {
        $requested = is_null($number) ? 1 : $number;

        $count = count($array);

        if ($requested > $count) {
            throw new InvalidArgumentException(
                "You requested {$requested} items, but there are only {$count} items available."
            );
        }

        if (is_null($number)) {
            return $array[array_rand($array)];
        }

        if ((int) $number === 0) {
            return [];
        }

        $keys = array_rand($array, $number);

        $results = [];

        if ($preserveKeys) {
            foreach ((array) $keys as $key) {
                $results[$key] = $array[$key];
            }
        } else {
            foreach ((array) $keys as $key) {
                $results[] = $array[$key];
            }
        }

        return $results;
    }

    /**
     * Set an array item to a given value using "dot" notation.
     *
     * If no key is given to the method, the entire array will be replaced.
     *
     * @param  array  $array
     * @param  string|null  $key
     * @param  mixed  $value
     * @return array
     */
    public static function set(&$array, $key, $value)
    {
        if (is_null($key)) {
            return $array = $value;
        }

        $keys = explode('.', $key);

        foreach ($keys as $i => $key) {
            if (count($keys) === 1) {
                break;
            }

            unset($keys[$i]);

            // If the key doesn't exist at this depth, we will just create an empty array
            // to hold the next value, allowing us to create the arrays to hold final
            // values at the correct depth. Then we'll keep digging into the array.
            if (! isset($array[$key]) || ! is_array($array[$key])) {
                $array[$key] = [];
            }

            $array = &$array[$key];
        }

        $array[array_shift($keys)] = $value;

        return $array;
    }

    /**
     * Shuffle the given array and return the result.
     *
     * @param  array  $array
     * @param  int|null  $seed
     * @return array
     */
    public static function shuffle($array, $seed = null)
    {
        if (is_null($seed)) {
            shuffle($array);
        } else {
            mt_srand($seed);
            shuffle($array);
            mt_srand();
        }

        return $array;
    }

    /**
     * Sort the array using the given callback or "dot" notation.
     *
     * @param  array  $array
     * @param  callable|array|string|null  $callback
     * @return array
     */
    public static function sort($array, $callback = null)
    {
        return Collection::make($array)->sortBy($callback)->all();
    }

    /**
     * Recursively sort an array by keys and values.
     *
     * @param  array  $array
     * @param  int  $options
     * @param  bool  $descending
     * @return array
     */
    public static function sortRecursive($array, $options = SORT_REGULAR, $descending = false)
    {
        foreach ($array as &$value) {
            if (is_array($value)) {
                $value = static::sortRecursive($value, $options, $descending);
            }
        }

        if (static::isAssoc($array)) {
            $descending
                    ? krsort($array, $options)
                    : ksort($array, $options);
        } else {
            $descending
                    ? rsort($array, $options)
                    : sort($array, $options);
        }

        return $array;
    }

    /**
     * Conditionally compile classes from an array into a CSS class list.
     *
     * @param  array  $array
     * @return string
     */
    public static function toCssClasses($array)
    {
        $classList = static::wrap($array);

        $classes = [];

        foreach ($classList as $class => $constraint) {
            if (is_numeric($class)) {
                $classes[] = $constraint;
            } elseif ($constraint) {
                $classes[] = $class;
            }
        }

        return implode(' ', $classes);
    }

    /**
     * Filter the array using the given callback.
     *
     * @param  array  $array
     * @param  callable  $callback
     * @return array
     */
    public static function where($array, callable $callback)
    {
        return array_filter($array, $callback, ARRAY_FILTER_USE_BOTH);
    }

    /**
     * Filter items where the value is not null.
     *
     * @param  array  $array
     * @return array
     */
    public static function whereNotNull($array)
    {
        return static::where($array, function ($value) {
            return ! is_null($value);
        });
    }

    /**
     * If the given value is not an array and not null, wrap it in one.
     *
     * @param  mixed  $value
     * @return array
     */
    public static function wrap($value)
    {
        if (is_null($value)) {
            return [];
        }

        return is_array($value) ? $value : [$value];
    }
}