I got so many empty element as well as null values in array and my SQL query is some what complex so i was not able to use IS NOT NULL inmysql Query. Only alternative way i have is removing this null values from array using PHP. I used is_null function of PHP and remove null elements from array. Be careful with “” and null as they are two different things. I you want to remove empty elements as well than you can use one more condition along with is_null. Look at below code. I hope this helps you a little.
if(!empty($rec))
{
foreach ($rec as $key=>$value)
{
if (is_null($value['column_name']))
{ // Check for null value of column
unset($rec[$key]); // remove row from array if null element found
}}}