php - Why this expression return error and how can I resolve? -

this question has answer here:

this code:

if(!empty(trim($_post['post']))){ }

return error:

fatal error: can't use function return value in write context in ...

how can resolve , avoid 2 checks ( trim , empty ) ?

i want check if post not blank space.

in documentation explains problem specifically, gives alternate solution. can use

trim($name) == false.

Brande