Count occurrences of each unique value in the second level of a 2d array

Current Array:

Array
(
    [12] => Array
        (
            [0] => 1AM
            [1] => 2AM
            [2] => 3AM
            [3] => 4AM
        )

    [13] => Array
        (
            [0] => 1AM
            [1] => 2AM
            [2] => 6AM
            [3] => 4AM
        )

    [14] => Array
        (
            [0] => 1AM
            [1] => 2AM
            [2] => 7AM
            [3] => 4AM
        )

)

Desired Output:

3 People Signed Up at 1AM,

3 People signed up at 2AM,

1 Signed up at 3AM

1 Signed up at 6AM

1 Signed up at 7AM

3 Signed up at 4AM

Current code:

foreach($array as $k => $v) {
    $result[$k] = array_count_values($v);
    arsort($result[$k]);
}
print_r($result);

In other words, just counting the times and storing them in a separate array or variable.

You can simply use array_count_values along with call_user_func_array like as

array_count_values(call_user_func_array('array_merge', $array));