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print_r outputs nothing for "false"

php.internals

Jakob Buchgraber

19 years ago

Hello!

While debuging I recognized that print_r does not output anything for
bool(false) (PHP 5.2.1).

e.g.
<?php
print_r (array (true, false, "String"));
?>

Expected result:
Array
(
[0] => 1
[1] => 0
[2] => String
)

Actual result:
Array
(
[0] => 1
[1] =>
[2] => String
)


I was not quite sure whether this is expected behavior, so I haven't
opened a bug yet.

So, is it expected and why?

Cheers,
Jay

Rasmus Lerdorf

19 years ago

Jakob Buchgraber wrote:

> Hello!
>
> While debuging I recognized that print_r does not output anything for
> bool(false) (PHP 5.2.1).
>
> e.g.
> <?php
> print_r (array (true, false, "String"));
> ?>
>
> Expected result:
> Array
> (
>     [0] => 1
>     [1] => 0
>     [2] => String
> )
>
> Actual result:
> Array
> (
>     [0] => 1
>     [1] =>
>     [2] => String
> )
>
>
> I was not quite sure whether this is expected behavior, so I haven't
> opened a bug yet.
>
> So, is it expected and why?

Because false is not 0.  0 evaluates to false, but so do many other things.

-Rasmus

Robert Deaton

19 years ago

http://www.php.net/manual/en/language.types.string.php#language.types.string.casting

--
--Robert Deaton

Stefan Walk

19 years ago

Hi,

for debugging i'd use var_dump, which doesn't output ambiguous things.

Regards,
Stefan