Question

Stupid question, I know, but if I don’t know whether a variable $var is set or not, should I use

isset($var) && !empty($var)

to check if it has any value in it, or is

!empty($var) enough? Would there be a problem if $var is null in the second case?

Answer 1

isset and empty are both language constructs. And empty() internally does an isset check first, then negates that, or alternatively also checks for values that equate FALSE in boolean context.

So yes, !empty() is sufficient.