2017-06-28 18:59 GMT+02:00 Kalle Sommer Nielsen <ka...@php.net>: > Hi David > > 2017-06-28 18:10 GMT+02:00 David Rodrigues <david.pro...@gmail.com>: > > Hello internals, > > > > Java supports the "final" keyword before a variable to determines that > this > > variables never change it reference. If I declare a variable as "final", > I > > can only initialize that once, then I could not change it after (but I > can > > manipulate the instance, without issues). > > > > There some special reason to PHP doesn't supports things like that? > > It seems like what you are looking for here is actually a constant[1]. > However constants do not support non scalar types, such as array or > objects,
Arrays are supported, but not objects. Regards, Niklas > what would really solve it on the objects side of things > would be the introduction of a "readonly" keyword or similar, like > that of C#[2] > > > final $number = 123; > > $number = 456; // Error: you change change final variables. > > > > final $object = new stdClass; > > $object->allowed = true; // No error. > > > > This feature make sense because it tells to dev that the variable value > > could not be updated directly (new reference). Which make easy to > identify > > when a variable is modifiable or not. > > > > It is valid for a RFC? > > > > - It can uses the "final" keyword; > > - It doesn't a BC; > > Anything is usually valid for an RFC, however I think (personally) > that this should rather be an RFC for a readonly keyword if anything > > > I too think that a final variable can be useful to make some internal > > improvements on language (but it could be a BC for PHP internals). I > mean, > > as the variable could not be modified, then it don't need be a "flexible" > > type internally (I guess that it is a zval, right?). > > > > Reference: https://github.com/kalessil/phpinspectionsea/issues/363 > > > > -- > > David Rodrigues > > > [1] http://php.net/constants > [2] https://docs.microsoft.com/en-us/dotnet/csharp/language- > reference/keywords/readonly > > -- > regards, > > Kalle Sommer Nielsen > ka...@php.net > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > >
