Is it right to use empty() function for checking an object is null?

Question

Say,

$obj = $this->someFunc(); // this returns an object

if(empty($obj)){ 
    // suppose $obj is null, it does works correctly
}

In http://php.net/manual/en/function.empty.php, empty() is only used for variables and arrays.

But, is it the correct way?

Answer 1

php has the function is_null() to determine whether an object is null or not: http://php.net/manual/en/function.is-null.php

Answer 2

null will cause empty() to return true. However, if you're checking to see if that value is actually null, is_null() is better suited for the job.