I wanna start using Google Analytics PHP API.
I found 2 libraries and I can't understand which one should I use and what is the main difference between them: gapi-google-analytics-php-interface and google-api-php-client
P.S. The main reason to use this API is requirement to work with goals.
google-api-php-client is for Google API's and not specifically for Google Analytics.
gapi-google-analytics-php-interface is a library that connects to your Google Analytics account and extracts data. You should use this client.
GAPI (said 'g,a,p,i') is the Google Analytics PHP5 Interface.
Would recommend following this tutorial.
Although, as I recall, the latest github library did not match the script and I had to find a previous version.
If you get a bunch of include errors, check the folder structure. I ended up downloading the previous version (which matched) and have had no issues using GA API since.
来源：https://stackoverflow.com/questions/12794674/php-api-for-google-analytics