PHP中多维数组的求和值

Question

Supposing I have this array in PHP:

Array
(
    [0] => Array
        (
            [name] => Banana
            [quantity] => 124
        )
    [1] => Array
        (
            [name] => Cherry
            [quantity] => 24
        )
    [2] => Array
        (
            [name] => Apple
            [quantity] => 224
        )

)

How can I sum the number with the key quantity ?

Thanks.