Edit report at https://bugs.php.net/bug.php?id=39579&edit=1
ID: 39579
Comment by: radamanf at gmail dot com
Reported by: iain at workingsoftware dot com dot au
Summary: Comparing zero & string values in boolean comparison
has unexpected behaviour
Status: Not a bug
Type: Bug
Package: Variables related
Operating System: FreeBSD 6.1
PHP Version: 5.2.0
Block user comment: N
Private report: N
New Comment:
This is a epic FAIL in pure logic of comparing formats not having explicitly
defining them, whole beauty of PHP disappear! This is BROKEN LOGIC.
Connected BUGS
Bug #44990
Bug #39579
Different people are coming across this BUG and thinking the same as me, so
please CHANGE your documentation, it's WRONG! Who is this "GENIES" to make
possible converting String to Integer NOT INT TO STRING!
Guys, I'm very disappointed! :)
Previous Comments:
------------------------------------------------------------------------
[2013-02-14 17:14:35] radamanf at gmail dot com
This is a epic FAIL in pure logic of comparing formats not having explicitly
defining them, whole beauty of PHP disappear! This is BROKEN LOGIC.
Connected BUGS
Bug #44990
Bug #39579
Different people are coming across this BUG and thinking the same as me, so
please CHANGE your documentation, it's WRONG! Who is this "GENIES" to make
possible converting String to Integer NOT INT TO STRING!
Guys, I'm very disappointed! :)
------------------------------------------------------------------------
[2012-08-01 10:31:16] v dot picture at free dot fr
Hi, I'm wondering why this comparison should be evaluated in a numeric context
and not a string context, after all
there is no loss with string casting whereas there is a huge risk of doing
mistakes with numeric casting:
(string) 0 => "0"
(string) 42.5 => "42.5"
(int) "test" => 0
But ok, let's say it's a normal behavior.
"If you compare a number with a string or the comparison involves numerical
strings, then each string is converted to
a number"
Then why would PHP decide to do that in a string context ? I mean, when I
compare two strings I don't expect PHP to
convert everything to numbers !
"10" == "1e1" => true
Sorry folks, this really seems like a string context to me.
------------------------------------------------------------------------
[2006-11-22 11:36:19] [email protected]
It's not a problem -- it's a feature, and it's documented at the address I've
just quoted, which describes evaluation of a string in any numeric context.
------------------------------------------------------------------------
[2006-11-22 11:14:47] iain at workingsoftware dot com dot au
it's not the behaviour of how a string is cast to an integer that i'm talking
about, but if i have a comparison:
if($value == Class::CONSTANT)
and the class constant is a string, it's not immediately apparent that if
$value == 0 then this will evaluate to true. maybe warning is too strong, but a
notice might be good in the event that a non-strict == operation returns true
because one of the operands is 0 and the other operand is a value that
evaluates to 0 when cast as an int.
anyway, i guess if php has been around for this long without anyone mentioning
it yet ... i mean, this is the first time i've come across the problem. if a
notice had been emitted it would have been a time saver.
------------------------------------------------------------------------
[2006-11-22 11:06:57] [email protected]
And, besides, this behaviour is documented at
http://www.php.net/manual/en/language.types.string.php#language.types.string.conversion
------------------------------------------------------------------------
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