have you tried following the readme file yourselves?

[Pionell]

I'm trying to set up a google admob report downloader, and a google play report downloader, but the php clients, readme files are last updated 4 years ago on multiple places and the examples are not working. The pages you are describing do not exist, client / project id are all different (maybe renamed?), nothing matches and is frustrating. If you can't update the readme's could you please just remove the old readme files? It's utterly confusing and not helpful whatsoever.
For example in this readme the instructions are:

Visit https://console.developers.google.com to register your application and generate an API key.

Click APIs & Auth in the left column, and then click Credentials.
ok, even though the sidebar is called APIs & Services.
Click Create new client ID to create a new client ID.
no such thing
In the Create Client ID window, choose Web application.
no such thing
In the Redirect URIs box, specify the URL for your PHP page, e.g., http://localhost/app.php.
Click Create Client ID.
no such thing. I think you get the point.

[tswast]

Sorry, @Pionell. This repository is in the googlearchive org because it is no longer maintained. See https://cloud.google.com/storage/docs/reference/libraries#client-libraries-install-php for the most recent samples for using Cloud Storage with PHP.