Environment::isLocalhost() 

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

Checks whether installation is running on local server

\nn\t3::Environment()->isLocalhost()
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| @return boolean

Source Code 

public function isLocalhost () {
	$localhost = ['127.0.0.1', '::1'];
	return in_array($_SERVER['REMOTE_ADDR'], $localhost);
}
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