Edit report at https://bugs.php.net/bug.php?id=54547&edit=1
ID: 54547
Comment by: chx1975 at gmail dot com
Reported by: peter dot ritt at gmx dot net
Summary: wrong equality of string numbers
Status: Verified
Type: Bug
Package: Unknown/Other Function
Operating System: linux
PHP Version: 5.3.6
Assigned To: dmitry
Block user comment: N
Private report: N
New Comment:
Now, while I can understand why PHP chooses "1" == 1 (HTML, sure) I am not too
sure how is that relevant when both sides are strings?? I am not quite sure why
the strings "1" and "1.0" would need to be ==. Just because "1" == 1 and "1.0"
==
1 does not mean "1" == "1.0". It's not transitive! Compare FALSE == 0; 0 ==
'x';
'x' == TRUE -- if it would be transitive then FALSE == TRUE, surely you don't
want that.
Previous Comments:
------------------------------------------------------------------------
[2012-04-12 21:23:40] vinny_182 at hotmail dot com
Equality is equality and neither string or numeric representations of the value
are equal. The bug IMO is in the conversion from string to float, the
conversion
has failed but a valid value is still returned. That's just plain wrong. If you
wrote unit tests for string to float conversions and this was the input you
would
expect it to return a null value or throw an exception.
------------------------------------------------------------------------
[2012-04-12 21:02:06] c at hotmail dot com
"In the majority of cases when dealing with HTTP requests and database results,
which is what PHP deals with most, the loose comparison makes life easiest on
the developer."
By 'the developer' I assume you mean people who can't type (string) or (int) ?
No other language has this issue because they aren't designed around
programmers who do not really understand how to program. Please make the
developer's life easier by making comparisons make sense.
------------------------------------------------------------------------
[2012-04-12 20:38:48] elementation at gmail dot com
It's absolutely unreal that this is even a discussion. PHP, the world doesn't
take you seriously and with bugs like this you provide further fodder.
Principle of Least Surprise â this should be a string comparison.
------------------------------------------------------------------------
[2012-04-12 20:32:57] b at hotmail dot vom
I would like to point out Perl is a weakly typed language, just like PHP, and
has
no issue with these cases. It's pretty weak from the developers to hide behind
the "But PHP is weakly typed!" argument.
------------------------------------------------------------------------
[2012-04-12 17:09:41] riel at surriel dot com
Conversion of numeric-looking strings to numbers does not have to be a problem,
as long as the code in the back end uses arbitrary-precision math. This is
slower than comparing a type that fits in a CPU register, but once you have
already spent the time to do an automatic type conversion, that really does not
matter.
When it comes to an operator like ==, every digit matters. Having == return
false when two items are different violates the principle of least surprise.
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https://bugs.php.net/bug.php?id=54547
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