The PHP Lexer does not recognize all PHP identifiers

Issue #917 resolved
Christophe Coevoet
created an issue

The regex matching all allowed variable names, function names and class names is documented in the PHP documentation. It is the following one: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*. See for instance (it is also available on the other doc pages about variables and classes).

But currently, Pygments seems to be matching only [a-zA-Z_][a-zA-Z0-9_]* (notice the missing \x7f-\xff range in both character classes).

Even though most PHP developers are not aware of this extended definition of what a letter is, some projects have started to use such names. See for instance Having a working syntax highlighting for these files would be great (Github uses Pygments for this).

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