Check for null field value

[Anon]

Hi,
I'm retrieving field values from a table.
How can I check whether a particluar filed value is null or not null?.
I tried using
if(isset($item->employeeid),
if($item->employeeid == "")
if($item->employeeid==null)

Nothing is working.
Can anyone help me out.Thanks in advance.

[Anon]

You could try

if(!trim($item->employeeid))
//no value

[Anon]

Hi,
Thanks a lot for your timely help.

[Anon]

Try to use ISNULL function

[Anon]

I couldn´t use any of the suggestions. I use a Pick D3 database via ODBC standard functions. And I need to check if a value is null. Thanks a lot for your help.