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Re: Unicode support [message #180983 is a reply to message #180982]

Sat, 30 March 2013 20:05

Christoph Becker
Messages: 91
Registered: June 2012

Karma:

Member

Thomas 'PointedEars' Lahn wrote:

> Christoph Becker wrote:
>
>> I am more concerned about the number of characters the string holds.
>> Say, I want to get the last character:
>>
>> $str = '€';
>> echo $str[2];
>>
>>> Because lack of precision in font reproduction, or even in guaranteeing
>>> which font may be selected, renders the former an 'open' question.
>>>
>>> strlen('€')===3 is in fact the correct answer.
>
> That depends on the character encoding of the source code. 3 is the correct
> answer for an *UTF-8*-encoded U+20AC EURO SIGN character, which is then
> encoded E2 82 AC. [1]

It is the correct answer for an UTF-8 encoded string, as strlen()
returns the length of string in bytes. But I doubt, that this is
usually expected, and IMO knowing the number of characters is more
useful for common *PHP* as opposed to low-level C programming.

>> I suppose most *higher level languages* define the length of a string as
>> the number of characters the string holds. Cf. ECMAScript's length
>> property and TCL's [string length]. Even PHP's mb_strlen() returns the
>> number of characters.
>
> AISB, unfortunately the “length” property of ECMAScript String instances is
> not a good example in that regard as it does _not_ mean the number of
> characters but the number of 16-bit units (UTF-16 code units, usually).
> That is only less obvious than with UTF-8 because all Unicode characters in
> the BMP can be encoded using only one such unit. (I am working on a
> workaround; you could call it “an mb_strlen() for ECMAScript
> implementations”.)

ECMA-262, Edition 5.1, Section 15.5.5.1, states:

| *length*
|
| The number of characters in the String value represented by this
| String object.

IMO the spec is quite clear here, and so the implementations might be in
error. Anyway, I appreciate your working on a workaround; may come in
handy. :)

--
Christoph M. Becker

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[Message index]

		mysql dynamic binding and pass-by-ref deprecated By: oldyork90 on Wed, 20 March 2013 03:49
		Re: mysql dynamic binding and pass-by-ref deprecated By: Jerry Stuckle on Wed, 20 March 2013 10:42
		Re: mysql dynamic binding and pass-by-ref deprecated By: oldyork90 on Wed, 20 March 2013 14:09
		Re: mysql dynamic binding and pass-by-ref deprecated By: Thomas 'PointedEars' on Wed, 20 March 2013 14:29
		Re: mysql dynamic binding and pass-by-ref deprecated By: The Cat in the Hat on Wed, 20 March 2013 21:58
		UTF-8 charset (was: mysql dynamic binding and pass-by-ref deprecated) By: Christoph Becker on Wed, 20 March 2013 22:45
		Re: UTF-8 charset (was: mysql dynamic binding and pass-by-ref deprecated) By: The Cat in the Hat on Wed, 20 March 2013 23:13
		Re: UTF-8 charset By: The Natural Philosoph on Wed, 20 March 2013 23:31
		Re: UTF-8 charset By: M. Strobel on Thu, 21 March 2013 09:11
		Re: UTF-8 charset By: adrian on Thu, 21 March 2013 14:31
		Re: UTF-8 charset By: The Natural Philosoph on Thu, 21 March 2013 16:22
		Re: UTF-8 charset By: M. Strobel on Thu, 21 March 2013 17:05
		Re: UTF-8 charset By: Thomas 'PointedEars' on Fri, 22 March 2013 00:17
		Re: UTF-8 charset By: Christoph Becker on Fri, 22 March 2013 00:55
		Unicode support (was: UTF-8 charset) By: Thomas 'PointedEars' on Fri, 22 March 2013 01:16
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 12:57
		Re: Unicode support By: Thomas 'PointedEars' on Sat, 30 March 2013 13:25
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 14:33
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 14:55
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 18:04
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 20:26
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 21:26
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 22:14
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 22:29
		Re: Unicode support By: M. Strobel on Sun, 31 March 2013 12:10
		Re: Unicode support By: The Natural Philosoph on Sun, 31 March 2013 12:41
		Re: Unicode support By: M. Strobel on Sun, 31 March 2013 17:12
		Re: Unicode support By: Thomas 'PointedEars' on Sat, 30 March 2013 19:18
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 20:05
		Re: Unicode support By: Thomas 'PointedEars' on Sat, 30 March 2013 20:19
		Re: Unicode support By: M. Strobel on Sun, 31 March 2013 12:06
		Re: Unicode support By: M. Strobel on Tue, 02 April 2013 17:59
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 14:29
		Re: UTF-8 charset By: The Natural Philosoph on Fri, 22 March 2013 10:50
		Re: UTF-8 charset By: M. Strobel on Fri, 22 March 2013 08:46
		Re: UTF-8 charset By: M. Strobel on Thu, 21 March 2013 17:36
		Re: UTF-8 charset [OT] By: adrian on Thu, 21 March 2013 18:22
		Re: UTF-8 charset [OT] By: Peter H. Coffin on Thu, 21 March 2013 20:00
		Re: UTF-8 charset [OT] By: Thomas 'PointedEars' on Fri, 22 March 2013 00:47
		Re: UTF-8 charset By: The Natural Philosoph on Wed, 20 March 2013 23:20
		Re: UTF-8 charset By: Scott Johnson on Wed, 20 March 2013 23:39
		Re: mysql dynamic binding and pass-by-ref deprecated By: Jerry Stuckle on Thu, 21 March 2013 03:29
		OT: Xnews mime-proxy (was: mysql dynamic binding and pass-by-ref deprecated) By: BootNic on Thu, 21 March 2013 14:53
		Re: mysql dynamic binding and pass-by-ref deprecated By: oldyork90 on Thu, 21 March 2013 13:43

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