I have been trying to import/include file in my php script file and somehow it is not working. I know this require_once question has been asked so many times [ 1. require_once with subfolders , 2. require_once() cant find the include path, 3. Using require_once for up directory not working] but none of them seemed to be working for me.
Blow picture will explain what I am trying to do clearly: 
What I tried and errors:
Attempt 1
require_once(__DIR__.'GoogleClientApi/src/Google/Service/Analytics.php'); echo 'Hey1'; //Does not echo this, means something went wrong above. require_once(__DIR__.'GoogleClientApi/src/Google/Client.php'); echo 'Hey2'; 
Error I get:

Attempt 2 (Fixed issue of attempt 1 but raised another issue.)
So I decided to use absolute path :
include '/Applications/MAMP/htdocs/GoogleClientApi/src/Google/Client.php'; echo 'Hey1'; include '/Applications/MAMP/htdocs/GoogleClientApi/src/Google/Service/Analytics.php'; echo 'Hey2'; Gives me error in Client.php file:
`Warning: require_once(/Google/Auth/AssertionCredentials.php): failed to open stream: No such file or directory in /Applications/MAMP/htdocs/GoogleClientApi/src/Google/Client.php on line 18` `Fatal error: require_once(): Failed opening required '/Google/Auth/AssertionCredentials.php' (include_path='.:/Applications/MAMP/bin/php/php5.5.10/lib/php') in /Applications/MAMP/htdocs/GoogleClientApi/src/Google/Client.php on line 18` Investigating upon I found Client.php (of Google APIs Client Library for PHP) has these lines which are actually present: require_once 'Google/Auth/AssertionCredentials.php'; // <-- Can't find require_once 'Google/Cache/File.php'; // <-- Can't find require_once 'Google/Cache/Memcache.php'; // <-- Can't find 
I do not what is going wrong here. Fixed attempt 1's issue but now errors are in google's own library which I do not know how to overcome. I assume I am doing something silly which I can not figure out. Any help or suggestion will be appreciated.
Warning: require_once(Google/Auth/OAuth2.php): failed to open stream: No such file or directory in /Applications/MAMP/htdocs/GoogleClientApi/src/Google/Auth/AssertionCredentials.php on line 18. Well OAuth2.php and AssertionCredentials.php are in the same directory under Auth and it tries to look in to wrong directory usingrequire_once "Google/Auth/OAuth2.php";in AssertionCredentials.php