Edit report at https://bugs.php.net/bug.php?id=47494&edit=1
ID: 47494
Comment by: lzsiga at freemail dot c3 dot hu
Reported by: philipp dot feigl at gmail dot com
Summary: htmlspecialchars does not throw E_WARNING on
multibyte problems
Status: Not a bug
Type: Feature/Change Request
Package: Strings related
Operating System: CentOS5
PHP Version: 5.2.8
Block user comment: N
Private report: N
New Comment:
If the name of the function were
'check_for_multibyte_validity_and_htmlspecialchars' then you'd be right, but
even then I'd lobby for a simple 'htmlspecialchars' function... Doing something
(ie multibyte validity check) that the user (the PHP-programmer in this case)
didn't specifically ask doesn't seem to me to be a good idea (see magic_quotes
for another example).
PS: Of course I wouldn't complaining (or even know about the whole question) if
the default value hadn't been changed to 'UTF-8' in 5.4.
Previous Comments:
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[2012-09-06 15:33:13] [email protected]
Also note that many, if not most, apps use this as their only validity filter
and
if you output invalid UTF-8, for example, it can lead to security problems like
the well-known IE 0xE0 XSS exploit. So at some point along the line you have to
do a multi-byte check and it may as well be here since we need to do it anyway.
------------------------------------------------------------------------
[2012-09-06 15:29:07] [email protected]
You assume ASCII7 compatibility for all encodings which is a bad assumption.
------------------------------------------------------------------------
[2012-09-06 11:39:19] lzsiga at freemail dot c3 dot hu
Imho htmlspecialchars should not check for multi-byte validity at all, because
it only deals with a few characters that are all in ASCII7, so it could safely
ignore every byte between 0x80 and 0xFF. The third parameter could be simply
ignored (as if it were 'ISO-8859-1')
------------------------------------------------------------------------
[2012-08-30 19:21:49] [email protected]
@the disappointed user: PHP 5.4 no longer throws said warning (it was just
confusing). Instead there are several new options for dealing with incorrect
encoding. Of particular interest is ENT_SUBSTITUTE, which will replace invalid
code unit sequences with the Unicode Replacement Character (instead of
returning a rather unhelpful empty string). This way you can easily spot where
the string is incorrectly encoded. Furthermore this option has the additional
advantage of being more graceful (it just removed individual incorrectly
encoded bytes, not the whole string).
Hope this helps you. More info in the docs: http://de2.php.net/htmlspecialchars
------------------------------------------------------------------------
[2012-08-30 19:01:22] another_disappointed_php_programmer at exam
This is very sad.
This is a bug, and it's sad that PHP core developers said that it's a feature
and it won't be fixed. I'm disappointed.
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