[SOLVED] If variable is null question

[salinah20]

I've been googling the net, and searching here, and all the answers I find seem to confuse me more than I was to start with.  I'm hoping some kind hearted soul here can put me on the right path.  For those have been coding PHP for a while this is probably a really easy question...

 

I have 2 variables (they're set from a mysql database and are working just fine) that I'm trying to do an if-then kinda thing on.  Something like:

 

If $subscriber is null and $ppl is not null then do this

If $ppl is null and $subscriber is not null then do this other thing

If $subscriber is null and $ppl is null then do nothing

 

I know how to fill in the "then do this" blank....what I can't seem to figure out is how to compare for "Is Null" or "Is Not Null" and put that in and If-Then-Else kinda thing.

 

Can anyone help me out here?

[trq]

Does is_null() help?

 

ps: However, you really ought test for this within your query if possible.

[salinah20]

That's half of it!  Thanks!

 

That works for the null fields....but how do I get it for the "not null" field?  I tried is_not_null(), but that didn't work...

[trq]

<?php

  if (is_null($var)) {
    // $var is null.
  } else {
    // $var is not null.
  }

?>

[aschk]

Just like you do normal not (!) statements...

if ( ! is_null( <statement> ) ) {
  then do blah...
}

[salinah20]

That did it....the !is_null() that is.

 

I figured it was an easy question. Thanks SO much!