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Re: Rejecting Certain Non-ASCII Characters [message #181184 is a reply to message #181181]

Sat, 20 April 2013 00:36

Christoph Becker
Messages: 91
Registered: June 2012

Karma:

Member

Jerry Stuckle wrote:
> On 4/19/2013 6:26 PM, Christoph Becker wrote:
>> Jim Higgins wrote:
>>> On Fri, 19 Apr 2013 19:38:02 +0200, in
>>> <kkrvda$od5$1(at)speranza(dot)aioe(dot)org>, Christoph Becker <cmbecker69(at)gmx(dot)de>
>>> wrote:
>>>
>>>> Jim Higgins wrote:
>>>> > I have a problem with people entering a slashed zero vs a standard
>>>> > ASCII zero into HTML forms intended to store data in a MySQL database.
>>>>
>>>> Is it really a slashed zero (U+0030 U+0338) they're entering, or do
>>>> they
>>>> enter some similar looking character such as the Danish Ø? In the
>>>> former case you can simply replace the slashed zero with a standard
>>>> zero. Assuming UTF-8 encoding:
>>>>
>>>> $input = str_replace('\xCC\xB8', '', $input);
>>>
>>>
>>> It's usually 0x41 0x7E, but sometimes 0xD8.
>>
>> 0xD8 is Ø in ISO-8859-1 for example; I do not know which character
>> encoding represents the same or a similar character as 0x41 0x7E.
>> Anyway, ISTM you're missing to enforce a particular character encoding
>> for your document (see <http://www.w3.org/TR/html4/charset.html> for
>> HTML 4.01 documents).
>>
>
> This is a recommendation only. The browser is free to ignore it. There
> is no way to force a browser to do anything in HTML.

The mentioned W3C recommendation also elaborates on the "charset"
parameter of the "Content-Type" header, which should be respected by all
user agents conforming to RFC 2616, if they have requested the URI with
a suitable "Accept-Charset" header. Otherwise the PHP script may
respond with "406 Not acceptable" (and a body explaining the requirements).

--
Christoph M. Becker

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[Message index]

		Rejecting Certain Non-ASCII Characters By: Jim Higgins on Fri, 19 April 2013 16:16
		Re: Rejecting Certain Non-ASCII Characters By: Lew Pitcher on Fri, 19 April 2013 16:29
		Re: Rejecting Certain Non-ASCII Characters By: Daniel Pitts on Fri, 19 April 2013 16:30
		Re: Rejecting Certain Non-ASCII Characters By: Jim Higgins on Fri, 19 April 2013 21:38
		Re: Rejecting Certain Non-ASCII Characters By: Jim Higgins on Fri, 19 April 2013 22:11
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Fri, 19 April 2013 16:48
		Re: Rejecting Certain Non-ASCII Characters By: Jim Higgins on Fri, 19 April 2013 21:46
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Fri, 19 April 2013 22:00
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Fri, 19 April 2013 23:23
		Re: Rejecting Certain Non-ASCII Characters By: Christoph Becker on Fri, 19 April 2013 17:38
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Fri, 19 April 2013 20:33
		Re: Rejecting Certain Non-ASCII Characters By: Christoph Becker on Fri, 19 April 2013 21:08
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Fri, 19 April 2013 23:12
		Re: Rejecting Certain Non-ASCII Characters By: Christoph Becker on Mon, 22 April 2013 11:25
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Mon, 22 April 2013 11:29
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Sat, 20 April 2013 12:08
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Sat, 20 April 2013 15:52
		Re: Rejecting Certain Non-ASCII Characters By: Jim Higgins on Fri, 19 April 2013 22:06
		Re: Rejecting Certain Non-ASCII Characters By: Christoph Becker on Fri, 19 April 2013 22:26
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Fri, 19 April 2013 23:53
		Re: Rejecting Certain Non-ASCII Characters By: Christoph Becker on Sat, 20 April 2013 00:36
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sat, 20 April 2013 00:58
		Re: Rejecting Certain Non-ASCII Characters By: Christoph Becker on Sat, 20 April 2013 01:34
		Re: Rejecting Certain Non-ASCII Characters By: Arno Welzel on Fri, 19 April 2013 20:19
		Re: Rejecting Certain Non-ASCII Characters By: M. Strobel on Sat, 20 April 2013 08:04
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Sat, 20 April 2013 12:15
		Re: Rejecting Certain Non-ASCII Characters By: M. Strobel on Sat, 20 April 2013 12:26
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Sat, 20 April 2013 12:34
		Re: Rejecting Certain Non-ASCII Characters By: Arno Welzel on Sat, 20 April 2013 12:41
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sat, 20 April 2013 12:43
		Re: Rejecting Certain Non-ASCII Characters By: Arno Welzel on Sat, 20 April 2013 12:55
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sat, 20 April 2013 13:04
		Re: Rejecting Certain Non-ASCII Characters By: Arno Welzel on Sat, 20 April 2013 19:29
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sun, 21 April 2013 00:03
		Re: Rejecting Certain Non-ASCII Characters By: Arno Welzel on Sun, 21 April 2013 04:51
		Re: Rejecting Certain Non-ASCII Characters By: Arno Welzel on Sun, 21 April 2013 04:57
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sun, 21 April 2013 12:45
		Re: Rejecting Certain Non-ASCII Characters By: Tim Streater on Sun, 21 April 2013 14:09
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sun, 21 April 2013 14:29
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sun, 21 April 2013 12:44
		Re: Rejecting Certain Non-ASCII Characters By: The Natural Philosoph on Sat, 20 April 2013 14:07
		Re: Rejecting Certain Non-ASCII Characters By: Jerry Stuckle on Sun, 21 April 2013 00:06
		Re: Rejecting Certain Non-ASCII Characters By: M. Strobel on Sat, 20 April 2013 15:43
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Sat, 20 April 2013 16:01
		Re: Rejecting Certain Non-ASCII Characters By: M. Strobel on Sat, 20 April 2013 16:17
		Address munging (was: Rejecting Certain Non-ASCII Characters) By: Thomas 'PointedEars' on Sat, 20 April 2013 16:23
		OT: Address munging (was: Re: Rejecting Certain Non-ASCII Characters) By: Arno Welzel on Sat, 20 April 2013 19:25
		Re: Rejecting Certain Non-ASCII Characters By: Denis McMahon on Sat, 20 April 2013 22:06
		Re: Rejecting Certain Non-ASCII Characters By: Thomas 'PointedEars' on Mon, 22 April 2013 12:10

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