phppost遍历有关问题

php post遍历问题

print_r($_REQUEST);

取到的值是

Array

(

    [c] => pay2

    [cart] => 1

    [itemid] => Array

        (

            [0] => 103

            [1] => 104

            [2] => 105

            [3] => 106

        )



    [PHPSESSID] => rdkrfasknosmg58o1r1d9i6pf5

)

foreach ($_REQUEST as $key => $value) 

{

    echo "Key: $key; Value: $value
\n";

}

遍历不能遍历出itemid ，如何才能遍历成1,2,3这样

------解决方案--------------------
foreach ($_REQUEST as $key => $value)
{
if(is_array($value)) $value = join(',', $value);
echo "Key: $key; Value: $value
\n";
}