Environment::t3Version() 

\nn\t3::Environment()->t3Version(); 

Get the version of Typo3, as an integer, e.g. "8" Alias to \nn\t3::t3Version()

\nn\t3::Environment()->t3Version();

if (\nn\t3::t3Version() >= 8) {
    // only for >= Typo3 8 LTS
}

| @return int

public function t3Version () {
	return \nn\t3::t3Version();
}