How to randomly get min value from Array?

I have an array with multiple similar minimum value. May I know how to randomly get one of the minimum value?

Here is my sample code:-

$aryNo = array(
                    0 => 34, 1 => 34, 2 => 51, 3 => 12, 4 => 12,
                    5 => 12, 6 => 56, 7 => 876, 8 => 453, 9 => 43,
                    10 => 12
);
$b = array_keys($aryNo, min($aryNo));  //Here only can get 1 value.
$intNo = $b[0];

May I know how to get min value list (3 => 12, 4 => 12,5 => 12,10 => 12) and randomly pick one of them so that I can set in $intNo?