Producto cartesiano - init, Php - rextester

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Producto cartesiano - init

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<?php //php 5.5.9

function cartesianProducto($sets)
{
    $cartesian = array();
    foreach ($sets as $key => $set) {
        
        // Si un grupo esta vacio no afecta el producto cartesiano
        if (empty($set)) {
            continue;
        }
        
        // Si esta vacio agregamos el primer grupo
        if (empty($cartesian)) {
            $cartesian[] = array();
        }
        
        //
        $subset = array();
        foreach ($cartesian as $product) {
            foreach($set as $value) {
                $product[$key] = $value;
                $subset[] = $product;
            }
        }
        $cartesian = $subset;
    }
    return $cartesian;
}

$_POST['dato'] = array(0=> 1, 1=> 3);
$_POST['dato2'] = array(0=> 2, 1=> 3);
$res = cartesianProducto(array('dato'=> $_POST['dato'], 'dato2'=> $_POST['dato2']));
echo "Primer set: \n";
print_r($res);

$_POST['dato'] = array();
$_POST['dato2'] = array(0=> 2, 1=> 3);
$res = cartesianProducto(array('dato'=> $_POST['dato'], 'dato2'=> $_POST['dato2']));
echo "Segundo set: \n";
print_r($res);

$_POST['dato'] = array();
$_POST['dato2'] = array();
$res = cartesianProducto(array('dato'=> $_POST['dato'], 'dato2'=> $_POST['dato2']));
echo "Tercer set: \n";
print_r($res);
    
?>

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Absolute running time: 0.14 sec, cpu time: 0.01 sec, memory peak: 7 Mb, absolute service time: 0,14 sec

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Primer set: 
Array
(
    [0] => Array
        (
            [dato] => 1
            [dato2] => 2
        )

    [1] => Array
        (
            [dato] => 1
            [dato2] => 3
        )

    [2] => Array
        (
            [dato] => 3
            [dato2] => 2
        )

    [3] => Array
        (
            [dato] => 3
            [dato2] => 3
        )

)
Segundo set: 
Array
(
    [0] => Array
        (
            [dato2] => 2
        )

    [1] => Array
        (
            [dato2] => 3
        )

)
Tercer set: 
Array
(
)