COUNT number of variables in array that are not NULL

You can use array_filter with is_null (as callback) for that:

count(array_filter($row, "is_null"))

If you want the ones that are not null, then you'd have to subtract that from the original array length still count($row) - count(array_filter(...))

Try something like that

$counter = 0;

foreach($row as $r)
{
    if($r !== null)
    {
        $counter++;
    }
}

echo "Total not null items : " . $counter;

The above code will work. Also the values into foreach are all set, otherwhise will not loop through them ;)

In case your array is like that :

$row = array(
    'ADDwav' => null,
    'ADDwav1' => 'somevalue',
    'ADDwav2' => 'anothervalue',
    'ADDwav3' => '',
    'ADDwav...' => '...',
    'ADDwav16' => null
);

and you like to count the values that are not empty or null then you have to modify the code in the next form :

$counter = 0;

foreach($row as $k => $r)
{
    if($r !== null || $r !== '')
    {
        $counter++;
    }
}

echo "Total not null items : " . $counter;

use array_filter and is_null

   foreach($row as $r)

      if($r !== null)
...
..
.

This one will remove the array which is false or null...

            $entry = array(
               0 => 'foo',
               1 => false,
               2 => -1,
               3 => null,
               4 => ''
              );

            echo  count(array_filter($entry));