Is empty("0") => true really intended?

[m23project]

Description

Hi,

I wondered about the result of checking the string "0" with the function empty.

The string isn't empty obviously, but as "empty" is a short version of

!isset($var) || $var == false

. "0" is casted to false. This is as defined, but astonishing, if you take the word empty verbatim.

Is it really the result developers expect, when checking a variable containing the string "0"?

The following code:

<?php
var_dump(empty("0"));
?>

Resulted in this output:

bool(true)

But I expected this output instead:

bool(false)

PHP Version

PHP 8.2.26

Operating System

Debian 12

[Girgias]

Yes, PHP considers the string '0' to be falsy, and empty() check that a variable exists and is not falsy.