PHP:連想配列をキーでグループ化する - Qiita

<?php $foods = [ ['name' => 'Apple', 'category' => 'fruits'], ['name' => 'Strawberry', 'category' => 'fruits'], ['name' => 'Tomato', 'category' => 'vegetables'], ['name' => 'Carot', 'category' => 'vegetables'], ['name' => 'water', 'category' => 'drink'], ['name' => 'beer', 'category' => 'drink'], ]; ?> <?php $expected = [ 'fruits' => [ ['name' => 'Apple', 'category' => 'fruits'], ['name' => 'Straw