how to check if value in mutidimension array are the same?

if I have multidimensional array like this

Array ( [0] => Array ( [value] => Dummy [key] => 5501____I2-6 )

[1] => Array
    (
        [value] => Dummy
        [key] => 5497____I2-2
    )

[2] => Array
    (
        [value] => Dummy
        [key] => 5502____I2-7
    )

[3] => Array
    (
        [value] => Dummy
        [key] => 5499____I2-4
    )

[4] => Array
    (
        [value] => Dummy
        [key] => 5496____I2-1
    )

[5] => Array
    (
        [value] => Dummy
        [key] => 5500____I2-5
    )

[6] => Array
    (
        [value] => Dummy
        [key] => 5503____I2-8
    )

[7] => Array
    (
        [value] => Dummy
        [key] => 5498____I2-3
    )

)

How can I check if each value in [value] => are the same ?

thank for help