Retrieve activity content and attachments
You need a Google API key, get it at https://console.developers.google.com
Insert your G+ user ID (like +googleplus or 101560853443212199687)
Acceptable values are 1 to 100
At this point the scrip is ready for use in your web page. Include and enjoy.
<?php include( "yourpathto/gplus.php"); ?>
If you get in trouble you can test all at https://developers.google.com/+/web/api/rest/latest/activities/list#try-it
...for support and hints: @apulice