+Comments is an extremly simple commenting system for your own website or blog,
based on the functionalities of the Google+ API. 

As the API is rather limited right now, here are some limitations to the system:
* To create a new comment feed for a new post/section, you have to make a new
  public Google+ post manually. Then, you have to get the ID of this post and
  pass it to the get_comments() method
* You/your users can't post new comments from within your website. Instead, they
  have to go to the activity on Google+ and comment there (a link to the
  activity is displayed, though)

### How to use this code:

* Move the folder 'plus_comments' to your webserver directory (you can rename
  the folder if your want)
* Include the 'plus_comments/comments.js' and 'plus_comments/comments.css' in 
  your website's head section
* Open the file 'plus_comments/config.php' and insert your Google+ API key there
  (you can set up other things there, too!)
* Make sure the 'plus_comments/url_cache.dat' is writable
* Add the following HTML code in the place, where the comments section shall
  be displayed:

  <div class="comments" id="ACTIVITY_ID_HERE"></div>

* That's it! The script grabs the comments automatically and inserts them into 
  the div element (of course you can use any other container element instead of
  a div, too (e.g. a section if you're going with HTML5))

A working example of the comments section can be found here:
http://plus.martinmatysiak.de/plus_comments/example.php

Or here if you want to see it in a 'production' environment:
http://martinmatysiak.de/blog/view/new-google-plus-api-features 

### Modifying the behaviour:

* If you want to alter the layout of the comments, just edit the 
  'tmpl_comment.php' template file. Just make sure not to alter the field 
  names. Furthermore, you can edit the 'tmpl_head.php' and  'tmpl_foot.php' 
  to alter the wrapping html code. The following fields are available in the 
  specific template files:

  tmpl_comment.php: 
  * $actorName : contains the full name of the commenter
  * $actorImage : contains a URI which links to a profile picture of the
    person who wrote the comment  
  * $actorUrl : contains the URL which links to the commenter's profile page
  * $published : contains a unix-timestamp of the date on which the comment
    has been published
  * $activityUrl : contains the URL which links to the activity on Google+
  * $comment : contains the actual comment

  tmpl_head.php and tmpl_foot.php:
  * $activityUrl : contains the URL which links to the activity on Google+

* If you don't want to use the JavaScript file, you can also include the 
  plus_comments.php file directly (don't forget the css stylesheet, too). 
  It contains the PlusComments class which is used to retrieve and render the 
  comments. The only parameter which is expected in the constructor is the 
  activityId of a Google+ post. You can then retrieve the comments using 
  PlusComments.get_comments() (as raw objects) or using PlusComments.render() 
  to get a String containing the rendered HTML-code using the templates 
  mentioned above. Please see the plus_comments.php file for further 
  documentation on available methods.

### To-do:

* Cache comments to reduce number of queries
* Move the activityUrl caching into a database (?)
* Write a nice little setup script, especially to make the previous two points
  simpler to realize

The following would be nice to have, but has to wait until the Google+ API
supports it:

* Create a new Google+ activity automatically
* Support posting of comments from within the website