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To: Rowan Collins <rowan.collins@gmail.com>, internals@lists.php.net,
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Date: Sun, 17 Sep 2017 14:18:44 +0200
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Subject: Re: [PHP-DEV] Progress or just 'a mess'?
From: cmbecker69@gmx.de ("Christoph M. Becker")

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