Add cas operation for apc adapter

[prolic]

No description provided.

[weierophinney]

Please add a unit test, if possible.

[prolic]

How to do that without concurrent threads?

[weierophinney]

@prolic Good point. :) Merging!

[weierophinney]

Merged to develop for release with 2.3.0, as it's a feature addition.

[marc-mabe]

This breaks the test. apc_cas allows only integer values but we allow all values :(
@Ocramius It's a bit late to revert - should I open a new issue? I'm currently not sure how to solve it.

[Ocramius]

@marc-mabe you could open a pull request with a failing test case...

[marc-mabe]

The test's are currently failing. Currently APC no enabled on travis - I'm working on a solution to enable more tests for travis.

https://travis-ci.org/marc-mabe/zf2/builds/43599825
WIP -> This one is using APCu as APC is not available by default on travis since PHP-5.5

[Ocramius]

@marc-mabe would throwing an exception if ! is_int() be a good idea here?

[marc-mabe]

@Ocramius I don't think so because other adapter accept it and it's not possible to check before.