Online PHP editor | refs for aNe4a

<?php $array = [ (object) ['id' => 1, 'category' => 'Pizza', 'product' => 'Large Pizza', 'complement_type' => 'Bread', 'option' => 'Brown bread'], (object) ['id' => 2, 'category' => 'Pizza', 'product' => 'Small Pizza', 'complement_type' => 'Bread', 'option' => 'White bread'], (object) ['id' => 3, 'category' => 'Pizza', 'product' => 'Small Pizza', 'complement_type' => 'Ingredients', 'option' => 'Olives'], (object) ['id' => 4, 'category' => 'Salads', 'product' => 'Green Salad', 'complement_type' => 'Extras', 'option' => 'Bacon'], (object) ['id' => 5, 'category' => 'Salads', 'product' => 'Cesars Salad', 'complement_type' => 'Extras', 'option' => 'Lettuce'], ]; $result = []; foreach ($array as $obj) { $result[$obj->category][$obj->product][$obj->complement_type] = $obj->option; } var_export($result);