How to organize a common code on the Bonus website: by subdomains

Question

How do I organize my site to use shared packages? Lets use Stackexchange as an example. There are many subdomains:

webapps.stackexchange.com         namespace StackExchange\webapps
programmers.stackexchange.com     namespace StackExchange\programmers
etc.

Each of the subdomain reuse libraries. Maybe there is a question class that is reused by all sites to help the layout ask a question page.

Will a package of questions be packaged in each of the packages of subdomains? Or all packages refer to a package of questions. In other words: what scenario takes place:

StackExchange\webapps\question
StackExchange\programmers\question

OR

StackExchange\webapps
StackExchange\programmers
StackExchange\question
WHERE StackExchange\Webapps and StackExchange\programmers use StackExchange\question

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Answer 1

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Answer 2

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require_once '/usr/share/php/apis/Google_Client.php';