Online PHP editor | output for FNKZI

<?php $category = function(string $name, $parent = null) { return new class($name, $parent) { public $name; public $parent; public function __construct(string $name, $parent = null) { $this->name = $name; $this->parent = $parent; } public function breadcrumbs(array $trail = []) { $trail[] = $this->name; return $this->parent ? $this->parent->breadcrumbs($trail) : $trail; } }; }; $product = function(string $name, ...$categories) use($category) { $categories = array_reduce(array_reverse($categories), function($set, $item) use($category) { if (!$set) { return $category($item); } return $category($item, $set); }); return new class($name, $categories) { public $name; public $categories; public function __construct(string $name, $categories) { $this->name = $name; $this->categories = $categories; } public function trail(string $separator = ' / '): string { return implode($separator, $this->categories->breadcrumbs()); } }; }; $book = $product('Harry Potter', 'books', 'hardback', 'young-adult'); $shoes = $product('Air Jordans', 'shoes', 'mens', 'sports', 'basketball'); $tapeMeasure = $product('Stanley 25', 'hardware', 'tools', 'measurement'); var_dump( $book->trail(), // books / hardback / young-adult $shoes->trail(), // shoes / mens / sports / basketball $tapeMeasure->trail() // hardware / tools / measurement );