Online PHP editor | refs for QMgKU

<?php $products = [1, 2, 3, 4, 5]; $vendors = ["Amazon", "Newegg", "Frys"]; $product_combinations = array(); function pc_permute($items, &$combinations, $perms = array()) { if (empty($items)) { $combinations[] = $perms; } else { for ($i = count($items) - 1; $i >= 0; --$i) { $newitems = $items; $newperms = $perms; list($foo) = array_splice($newitems, $i, 1); array_unshift($newperms, $foo); pc_permute($newitems, $combinations, $newperms); } } } // Build product combinations pc_permute($products, $product_combinations); // Build vendor combinations var_dump($combinations);