algorithm.php

<?php

$arr = array(
	'Color' => array('Red', 'Blue'),
	'Size' => array('Regular', 'Large'),
	'Material' => array('Metalic', 'Nylon')
);

function magic_algorithm($arr){
	// 
}

$result = magic_algorithm($arr);

$expected = array(
	"Color: Red; Size: Regular; Material: Metalic",
	"Color: Red; Size: Regular; Material: Nylon",

	"Color: Red; Size: Large; Material: Metalic",
	"Color: Red; Size: Large; Material: Nylon",

	"Color: Blue; Size: Regular; Material: Metalic",
	"Color: Blue; Size: Regular; Material: Nylon",

	"Color: Blue; Size: Large; Material: Metalic",
	"Color: Blue; Size: Large; Material: Nylon"
);


echo ($expected == $result) ? "Passed" : "Failed";
print_r($result);
echo "\n";

Looks a cartesian product quiz.