setting variables using logcial OR

Question

$db_hased_pw = $result["password"] || false;

I understand the usage of this line of code, but WHEN will it evaluate as false?

will $db_hased_pw equal false only when $result["password"] is undefined?

or is $db_hased_password be set to false if $result["password"] is unset, or false, or zero, or null?

Answer 1

It will evaluate to false when $result["password"] is a "falsy value". The page on empty describes these values.

These would be equivalent:

$db_hased_pw = !!$result["password"];
$db_hased_pw = (bool) $result["password"];

If $result["password"] can indeed be undefined, you should be using:

$db_hased_pw = !empty($result["password"]);

to avoid a notice.