Re: how php knows the charset of my code?

Thanks Rob! So its all about ASCII. Nice to hear that php6 will address this issue. I wonder what there will be implemented... In addition to that, i hope there will be a really good default solution for processing multibyte-strings, but thats another story... :) -- Greetings, drysler Rob Nicholson schrieb:

drysler, So you are asking about what PHP6 calls "script_encoding". PHP5 does not have this concept. PHP5 does not know the character set that your script is encoded in. The script can be encoded in any character set that is "ASCII compatible". ASCII compatible encodings have the property that any byte value which has a meaning as an ASCII character has the same meaning in the character set. iso-8859-1 or utf-8 both have this property whereas utf-16 for example does not. There are rules about what characters can be used in identifiers, (see http://uk.php.net/manual/en/language.functions.php#functions.user-defined) but you'll see that these are described in terms of byte values. Thus when you define an identifier or string literal in a script it is simply treated as a series of byte values by PHP without any understanding of the meaning of those byte values other than if they happen to represent ASCII characters. Rob. drysler <drysler@gmx.de> wrote on 27/09/2007 20:32:09:

On 9/27/07, drysler <drysler@gmx.de> wrote:

Hello, i am practising with charsets at the moment and so i thought: -> How does PHP know the charset i use in my source-code? -> Are php-sources limited to specific charsets? -> In which areas you have to be aware of the source-code-charset? Perhaps somebody here on the list can tell something about these

issues?

Thanks!

Unless I'm mistaken, PHP expects the source files to be in the internal charset, which is ISO-8859-1. If you use the mbstring extension, you can use different internal encodings. See: http://www.php.net/mbstring Another good read on charset vs. PHP is: http://www.phpwact.org/php/i18n/charsets?s=utf -- troels

I think, the problem may be divided into 2 areas: 1) handling charsets of data (e.g. regex or string functions) ------------------------------------------------------------------------ No unsolvable problem. You have to know (and/or validate) the charset of

the data you process, no matter if typed in in the source code or loaded

from other data sources. There are "tools and workarounds" available, to

do the things right. 2) paying attention to the charset of the source code ------------------------------------------------------------------------ This is the main issue, i wanted to address with my posting. I asked myself, if there can be characters i use as source code, which php perhaps can not recognize because of the charset i used in the source-code-document. Or perhaps in php are only characters "allowed", which are represented all the same in all supported charsets, so there might be a list of charsets, you can safely use when scripting php. I mean, is there a difference (bytes?) writing the following in iso-8859-1 or utf-8? public function foo($bar = true) { return self::SOME_CONSTANT; } And if there is a difference, how php knows what i typed? So many questions .... :) -- Greetings, drysler -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php

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