basic API command to select a project


I know quite a bit PHP, but I find it hard to find my way into using the API...
Is there more documentation than the example on this page: ?

Maybe if I would be more familiar with "SOAP" it would be self exploratory, but I simply do not find any more info...

For example: In the example there is code to update a project like:
$project->tags = 'high';
$projectUpdateResult = $api->projects->update($project);

And beforehand $project is defined by creating a new project.

But how do I set $project to an already existing project when I know the id of it?
(yes, as simple as that)

Thanks for the help!
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