How to get request content (body) in PHP?

Use file_get_contents("php://input") (manual).

In PHP older than 7.0 you could also use $HTTP_RAW_POST_DATA (depending on always_populate_raw_post_data setting).

Try this

$xml = file_get_contents('php://input');

From the manual:

php://input is a read-only stream that allows you to read raw data from the request body.

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