A little confusion

[Liquid Fire]

I am right now getting a little confusing with finding is a value is null because there are several ways.  I mean the ways I know of checking stuff are :

 

isset()

is_null()

empty()

$var != null

$var !== null

 

now there are usually only 2 cases I need which are if it is null or if it is valid.  now for the first one i know to use $var === null.  Now the second one, what i consider a valid value is if it is not null and not an empty string ('').  Do one of these provide the second option?

[revraz]

How about checking if strlen > 0 ?

[rhodesa]

By what you describe, false would be a valid value. In this case, just strlen won't work. But put it with !== null and that should cover it:

 

<?php
  if($var !== null && strlen($var)){
    echo 'valid';
  }
?>