zicht / itertools

 * @param array|string|\Iterator $iterable Additional $iterable parameters may follow

 * @return MapIterator

 */

function map($strategy, $iterable)

{

    // note, once we stop supporting php 5.5, we can rewrite the code below

    // to the map(...$iterables) structure.

    // http://php.net/manual/en/functions.arguments.php#functions.variable-arg-list

    if (func_num_args() > 2) {

        $iterables = array_slice(func_get_args(), 2);

    } else {

        $iterables = [];

    }

    if (!($iterable instanceof ChainInterface)) {

        $iterable = iterable($iterable);

    }

    return call_user_func_array([$iterable, 'map'], array_merge([$strategy], $iterables));

}

/**

 * Select values from the iterator by applying a function to each of the iterator values, i.e., mapping it to the

 * @param array|string|\Iterator $iterable Additional $iterable parameters may follow

 * @return ZipIterator

 */

function zip($iterable)

{

    // note, once we stop supporting php 5.5, we can rewrite the code below

    // to the zip(...$iterables) structure.

    // http://php.net/manual/en/functions.arguments.php#functions.variable-arg-list

    if (func_num_args() > 1) {

        $iterables = array_slice(func_get_args(), 1);

    } else {

        $iterables = [];

    }

    if (!($iterable instanceof ZipInterface)) {

        $iterable = iterable($iterable);

    }

    return call_user_func_array([$iterable, 'zip'], $iterables);

}

/**

 * Returns an iterable with all the elements from $iterable reversed