User data

Tell me how, in PHP, to display (Echo or Print) user data, such as
IP, browser, connection speed. I do not understand, these are variables and what values ​​are taken from the user. What other data can be taken?

Answer 1, authority 100%


And then you will understand.

Answer 2, authority 50%

$_SERVER['HTTP_USER_AGENT'] // UserAgent => 

Answer 3, authority 50%

Comprehensive information:
$_SERVER Superglobal

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