printing from multidimensional arrays?

I have a multi array that looks like this:

$_SESSION['cartItems']['quantity']

How do I print out its val开发者_运维技巧ues? print_r won't work, unless $_SESSION doesn't support multi-dimensional arrays?

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print_r($_SESSION['cartItems']); should work.

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you can use var_dump($_SESSION). However, print_r should work. Make sure you are doing print_r($_SESSION), and not trying to print_r your variable that may not exist.

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If you want to get the quantity of each card item in the array, you can do this:

$quantities = array_map(create_function('item', "$item['quanitity']"), $_SESSION['cardItems']);

// PHP 5.3
$quantities = array_map(function($item) {
    return $item['quanitity'];
}, $_SESSION['cardItems']);