RE: [PHP-DEV] Proposal for PHP 7 : case-sensitive symbols

Hi, > De : yohgaki@gmail.com [mailto:yohgaki@gmail.com] De la part de Yasuo Ohgaki > > > I would like to propose that namespaces, functions, and classes become > > case-sensitive (constants are already case-sensitive). Actually, I never > > understood why they are case-insensitive. Even if the performance gain is > > negligible, I think it could be the right time to question this. > > > > I'm writing this mail without reading current zend code. > > Anyway, is it feasible to raise E_DEPRECATE without much performance > penalty? > For example, > > if (!strcmp(name, name_to_be_searched)) { > do_something; > } else if (!strcasecmp(name, name_to_be_searched) { > rase_error; > do_something; > } > > Duplicated codes may be removed by macro. strcasecmp() checks may be > removed > 10 years later or more. Unfortunately, raising an E_DEPRECATED on case-sensitive mismatch is a huge work, as case-insensitivity appears in a lot of locations throughout the core. And the macro approach is not possible. Actually, case insensitivity goes well beyond class and function names: it also includes namespaces, scope resolution operators (self, parent, static), class magic methods, method names (properties are already case-sensitive), language keywords, and some stream wrapper protocols (like file and zlib). All these case insensitive comparisons are done in a variety of ways, at various locations in the code. Most store and compare names converted to lowercase (which implies a problem with Unicode as correct conversion with an unknown character set is impossible), some use strncasecmp... So, making the code case-sensitive would be a important work, but raising an E_DEPRECATED message would require much more work. Unfortunately, you can forget the idea of a macro that can be removed anytime in the future :) Cheers François