Request::getBasicAuth() 

\nn\t3::Request()->getBasicAuth(); 

Read the Basic Authorization Header from the request. If available, the username and password are returned.

$credentials = \nn\t3::Request()->getBasicAuth(); // ['username'=>'...', 'password'=>'...']
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Example call from a test script:

echo file_get_contents('https://username:password@www.testsite.com');
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| @return array

Source Code 

public function getBasicAuth()
{
	$username = '';
	$password = '';
	if (isset($_SERVER['PHP_AUTH_USER'])) {
		$username = $_SERVER['PHP_AUTH_USER'];
		$password = $_SERVER['PHP_AUTH_PW'];
	} else {
		$check = ['HTTP_AUTHENTICATION', 'HTTP_AUTHORIZATION', 'REDIRECT_HTTP_AUTHORIZATION'];
		foreach ($check as $key) {
			$value = $_SERVER[$key] ?? false;
			$isBasic = strpos(strtolower($value), 'basic') === 0;
			if ($value && $isBasic) {
				$decodedValue = base64_decode(substr($value, 6));
				[$username, $password] = explode(':', $decodedValue) ?: ['', ''];
				break;
			}
		}
	}
	if (!$username && !$password) return [];
	return ['username'=>$username, 'password'=>$password];
}
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