Online PHP editor | output for PBtHA

<?php class Item { private $id; private $name; function __construct(int $id, string $name) { $this->id = $id; $this->name = $name; } public function __get($prop) { return $this->$prop; } } $itemList = [ new Item(1, "Item 1"), new Item(2, "Item 2"), new Item(3, "Item 3"), new Item(4, "Item 4") ]; echo implode(',', array_map(fn($obj) => $obj->id, $itemList)); echo "\n---\n"; echo array_reduce( $itemList, fn($result, $obj) => $result . ($result ? ',' : '') . $obj->id );