Provide class/class constant completion

[Koc]

1. For some cases better add constant completion instead of plain strings (in this case we should import class maybe before completion):
   • Symfony\Component\HttpFoundation\Response https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/Response.php#L21
   • Symfony\Component\Console\Output\OutputInterface https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Console/Output/OutputInterface.php#L55
2. Starting from php 5.5 we could use ::class magic constant and better use this reference in some cases like behat context classes or form types. But maybe it should be configurable

[Haehnchen]

some examples Request::isMethod newRequest(null, <caret>). logic already implemented in FormType / getRepository. just a custom sorter is missing

[Koc]

Yes, in FormType it works ok. Maybe we should add some flag to json and plugin settings that it is possible import class as class and do not use plain strings.

[Koc]

Also it can be contributor for class constants - grep constants by prefix, like PATHINFO_* for http://ua2.php.net/manual/en/function.pathinfo.php

[Koc]

@Haehnchen is it possible create contributor for class constants? For example I want add autocomplete for defined/constant native PHP functions.

[Koc]

Also it is better suggest FILE_* constants for the 3rd argument of file_put_contents instead of other variables. Maybe push it to the top of the suggestions list.