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Date: Sun, 17 Sep 2017 15:45:32 +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 14:37, Rowan Collins wrote:

> That makes much more sense, but doesn't answer the other question, of if there's a working definition of what we mean by "case insensitive".

For case-insensitive constants zend_register_constant() uses
zend_str_tolower_copy() which uses zend_tolower_ascii() which looks up
in tolower_map:
<https://github.com/php/php-src/blob/php-7.0.23/Zend/zend_operators.c#L46-L63>.
 As the name already says, this is a simple ASCII lower case mapping
(A-Z are mapped to a-z; all others map to themselves).  So only
identifiers consisting solely of ASCII characters can actually be
case-insensitive.

I presume that this map is also used for other case-insensitive identifiers.

-- 
Christoph M. Becker