I want to propose a lazier version of merge: merge [] ys = ys merge (x:xs) ys = x:merge ys xs For one example use case you can check a recent SO question about lazy generation of combinations. The version in the accepted answer is unnecessarily strict in the second argument and that’s what is … Read more
$data = array( 0 => array( 0 => ‘1’, 1 => ‘a’, 2 => ‘3’, 3 => ‘c’, ), 1 => array( 0 => ‘2’, 1 => ‘b’, ), ); $newArray = array(); $mi = new MultipleIterator(MultipleIterator::MIT_NEED_ANY); $mi->attachIterator(new ArrayIterator($data[0])); $mi->attachIterator(new ArrayIterator($data[1])); foreach($mi as $details) { $newArray = array_merge( $newArray, array_filter($details) ); } var_dump($newArray);