Adds PubSub example for PHP

[bshaffer]

TODO: add tests

[bshaffer]

If we merge googleapis/google-api-php-client#715 we can remove this line

[bshaffer]

This library relies on googleapis/google-api-php-client#712 for the PubSub API calls

[bshaffer]

@SurferJeffAtGoogle @tmatsuo

[SurferJeffAtGoogle]

Add a comment for the class.

[bshaffer]

this might be an overkill sample... there are calls made to datastore which clutter what we're trying to do.

I can split this into two samples - datastore and pubsub - and try to simplify the pubsub part.

[SurferJeffAtGoogle]

It's not clear to me what the app does. I don't know what data is being
stored where and why. An overview in the README.md would help.

On Wed, Oct 28, 2015 at 3:33 PM, Brent Shaffer [email protected]
wrote:

this might be an overkill sample... there are calls made to datastore
which clutter what we're trying to do.

I can split this into two samples - datastore and pubsub - and try to
simplify the pubsub part.

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#13 (comment)
.

[bshaffer]

Plan for this example:

1. Split into 2 examples - pubsub and datastore
2. Add pull to the pubsub example
3. Make pubsub example store messages in memory only, and add note when on appengine that strange behavior may happen across multiple instances.

[SurferJeffAtGoogle]

Could we please not lead users down the wrong path in step 3? Isn't there
another example we could show?

I got really annoyed in the cloud training class when they said "build it
like this. But, of course you could never build a production system like
this."

On Fri, Oct 30, 2015 at 3:38 PM, Brent Shaffer [email protected]
wrote:

Plan for this example:

1. Split into 2 examples - pubsub and datastore
2. Add pull to the pubsub example
3. Make pubsub example store messages in memory only, and add note
   when on appengine that strange behavior may happen across multiple
   instances.

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#13 (comment)
.

[bshaffer]

@SurferJeffAtGoogle That's not the same IMHO - we aren't building production software for the users, we are building simple examples. Our samples shouldn't be opinionated in implementation detail that varies for each application.