function get(array $array, string $path);
function each(array $array, callable $callback)
function filter(array $array, callable $callback)
function reject(array $array, callable $callback)
function map(array $array, callable $callback)
function reduce(array $array, callable $callback, mixed $initialValue)
function sort(array $array, string $elementPath)
function is1d(array $array)
function is2d(array $array)

文档：https://eznio.github.io/ar/