symfony/symfony — pull request #8815 by tgabi333 (2013-08-21 14:59:22+00:00)
Title: fix for Process:isSuccessful()

| Q | A
| ------------- | ---
| Bug fix? | [yes]
| New feature? | [no]
| BC breaks? | [no]
| Deprecations? | [no]
| Tests pass? | [yes]
| Fixed tickets | []
| License | MIT
| Doc PR | []

This is a rebase of https://github.com/symfony/symfony/pull/8801

If you call isSuccessful() on a running process you would get true because of 0 == null. I think that is not the expected behavior and that is not what phpdoc @return block said so.