Update AbstractSessionArrayStorage.php

[SilverioMiranda]

I dont know how to reproduce, i tried for two days to track where the session variable is set to 0 but i dont find it.
Maybe this is a memory problem, i cant guarantee

But this change fix the problem and i think that this need to be merged to help others with same problem like :

https://stackoverflow.com/questions/43901035/session-array-storage-in-zend-framework-2-throwing-warning

Provide a narrative description of what you are trying to accomplish:

• Are you fixing a bug?

  • Detail how the bug is invoked currently.
  • Detail the original, incorrect behavior.
  • Detail the new, expected behavior.
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  • Add a regression test that demonstrates the bug, and proves the fix.
  • Add a CHANGELOG.md entry for the fix.

• Are you creating a new feature?

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  • Add only one feature per pull request; split multiple features over multiple pull requests
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• Is this related to quality assurance?

• Is this related to documentation?

[Ocramius]

This usually happens when loading/saving a session in a separate script that doesn't have a configured autoloader. Have you tried that?

[weierophinney]

Thanks, @SilverioMiranda