php shuffle array keys

Array
(
    [four] => four_4
    [one] => one_1
    [nine] => nine_9
    [six] => six_6
    [two] => two_2
    [five] => five_5
    [eight] => eight_8
    [seven] => seven_7
    [three] => three_3
    [ten] => ten_10
)