Online PHP editor | refs for a4OPU

<?php $taxonomies = [ 'genres' => [ 'label' => 'Genres', 'value' => 'genres' ], 'somethingelse' => [ 'label' => 'foo', 'value' => 'bar' ], 'movie_tags' => [ 'label' => 'Movie Tags', 'value' => 'movie_tags' ], 'portfolio_category' => [ 'label' => 'Portfolio Categories', 'value' => 'portfolio_category' ] ]; $postTypes = [ 'movies' => ['genres', 'movie_tags'], 'portfolio' => ['portfolio_category'], ]; $result = []; foreach ($postTypes as $group => $taxKeys) { foreach ($taxKeys as $taxKey) { $result[$group][] = $taxonomies[$taxKey]; } } var_export($result);