当数据值为null时，不在数据库JSON字符串中插入

Question

I'm working with JSON string (array data) coming from AJAX.

Until now, it's working. But last few days, I receive apparently from Ukraine (ip analyse) JSON array with 'data:null'.

Is it possible to code a condition before insert in database with an error message?

Currently I am checking with:

if($item[0]['data1'] !=Null || $item[0]['data1'] !='') 
{ insert request } 

and the same for the other array data

Is it correct ?