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Doc Bug #29977 bool cast of "0000000000000"
Submitted: 2004-09-04 01:22 UTC Modified: 2005-03-14 09:13 UTC
From: hd dot php at aimail dot de Assigned:
Status: Not a bug Package: Documentation problem
PHP Version: 4.3.10 / 5+ OS: linux
Private report: No CVE-ID: None
View Developer Edit
 [2004-09-04 01:22 UTC] hd dot php at aimail dot de 
Description:
------------
* PHP Version 4.3.4 *

bool cast of "0000000000000" should be false, not true.

A "0000000000000" is returned from mysql timestamp fields.

(bool)"0000000000000"
should be consistent with
(bool)(int)"0000000000000"

At this point it is not.



Reproduce code:
---------------
<?
echo((bool)"0000000000000"?"true":"false");
?>

Expected result:
----------------
false

Actual result:
--------------
true

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 [2004-09-05 10:04 UTC] aidan@php.net 
"00" is a string, like any other string. The only other string that will evaluate to false is "0".

This may, however, be something we should fix, and at the very least document - what do others think?

TRUE: $ php -r 'var_dump((bool)"00");'
FALSE: $ php -r 'var_dump((bool)"0");'
 [2005-03-13 21:46 UTC] sniper@php.net 
Document it.
 [2005-03-14 08:46 UTC] mail at etarion dot de 
Well, it is documented. In the type juggling section it is said that the only strings evaluating to false are "" and "0".
 [2005-03-14 09:13 UTC] vrana@php.net 
Already documented at http://php.net/language.types.boolean: "When converting to boolean, the following values are considered FALSE: ... the empty string, and the string "0" ... Every other value is considered TRUE."
 
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