Ask to get the value of the key in the array is not empty number, with what function

What is the function that gets the number of the key in the array that is not empty?
For example, arrays:

Array
(
[0] = = AA
[1] = BB
[2] + = CC
[3] = =
)

If count is used, the result is 4, and the key with no value is included. But I want to get the number of keys that are not empty? Should be 3, what functions can be implemented?

------Solution--------------------

$arr = Array (
0 = ' AA ',
1 = ' BB ',
2 = ' CC ',

);
function Filter_empty ($var) {
Return! Empty ($var);
}
echo Count (Array_filter ($arr, ' filter_empty '));

------Solution--------------------

Print_r (Count (Array_filter ($arr)));
/*
Manual
Array Array_filter (array $input [, callback $callback])
If the callback function is not provided, Array_filter () will delete all entries in input that are equal to FALSE
Null Boolean value is False
*/

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