php - Determining if an array of NULL values is considered empty -

i'm building array determine if need take action. executing query. table has sent_date field determine if email has been sent user or not. once has been sent user, sent_date field populated getdate(). here how i'm building:

$sent_date_sql = "     select ind_id, sent_date profileemail ";  $results = dbexec($sent_date_sql); 

i build array:

foreach ($results $r){     array_push($sent_date,$r['sent_date']);     $query_count = count($results); } 

this working gloriously. issue when go check sent_date array. first time in month script runs, sent_date values null. array looks like:

array(228) {   [0]=>   null   [1]=>   null   [2]=>   null   [3]=>   null   [4]=>   null 

...etc.

now going try evaluate $sent_date:

if(empty($sent_date)){ 

my empty condition never hits because values of array null. there alternative way achieve trying do? should looping through $sent_date array , evaluating each value?

if (!array_filter($sent_date)) 

array_filter removes "empty" elements array. if elements in array "empty", result array no elements (array()). empty array evaluates false.