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Re: Unicode support [message #180980 is a reply to message #180979] Sat, 30 March 2013 14:55 Go to previous messageGo to previous message
Christoph Becker is currently offline  Christoph Becker
Messages: 91
Registered: June 2012
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The Natural Philosopher wrote:

> On 30/03/13 13:25, Thomas 'PointedEars' Lahn wrote:
>
>> The same issue exists with characters outside the BMP in ECMAScript
>> implementations which uses 16-bit characters (usually one UTF-16 code
>> unit
>> per character). But you can work around that rather efficiently.
>>
>
> The problem become 'what do you mean by strlen()' - the space the
> characters will occupy in an constant width font, or the storage
> allocated to the string?
>
> Mostly we are concerned with the latter.

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.

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.

C is quite a different thing.

--
Christoph M. Becker
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