PHP: rfc:resource_typehint

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====== PHP RFC: Resource typehint ======
  * Version: 0.1
  * Date: 2015-11-11
  * Author: Ben Scholzen, mail@dasprids.de
  * Status: Under Discussion
  * First Published at: https://wiki.php.net/rfc/resource_typehint

===== Introduction =====
So far, every PHP type is supported by both parameter typehints and return types, except resources. This RFC should close this gap.

===== Proposal =====
The ``resource`` typehint and return type should be added to the engine, working the same way like ``is_resource()`` does. This would also mean to make ``resource`` a reserved classname.

<code php>
function should_return_resource(): resource {
    return true; // Return value of should_return_resource() must be of the type resource, boolean returned
}
</code>

<code php>
function only_accepts_resource(resource $foo) {
}

only_accepts_resource(fopen('php://memory', 'w'));
</code>

===== Backward Incompatible Changes =====
This RFC adds ``resource`` as reserved classname. This may collide with existing classes which are neither namespaced nor prefixed.

===== Proposed PHP Version(s) =====
This is proposed for the next minor version of PHP, currently PHP 7.1.

===== Proposed Voting Choices =====
As this is a language change, a 2/3 majority is required. The vote is a straight Yes/No vote for accepting the RFC and merging the patch.

===== Patches and Tests =====
Considered final patch:
https://github.com/php/php-src/pull/1631
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