Re: Progress or just 'a mess'?
| From: | Christoph M. Becker | Date: | Sun, 17 Sep 2017 12:18:44 +0000 |
| Subject: | Re: Progress or just 'a mess'? | ||
| References: | 1 2 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-100689@lists.php.net to get a copy of this message | ||
On 17.09.2017 at 12:53, Rowan Collins wrote:
> I checked the PHP lang-spec repo expecting to find a set of Unicode classes, but it currently
> mentions "U+0080-U+00FF":
> https://github.com/php/php-langspec/blob/master/spec/09-lexical-structure.md#names
> That seems wrong to me, unless I'm looking at the wrong definition - the first part of that
> range is control characters, and you can have variables called things like $🐘 (with an emoji as
> the entire name).
The specification in the PHP manual[1] appears to be more appropriate
for our current implementation:
| As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-
| \xff][a-zA-Z0-9_\x7f-\xff]*'
With regard to control characters: that depends on the chosen character
encoding; for instance in Windows-1252 the ¢ character is mapped to \xA2.
[1] <http://php.net/manual/en/language.variables.basics.php>
--
Christoph M. Becker