Função em PHP para capturar Bearer Token

Funções em PHP para capturar do Header de uma request o Bearer Token

		 /**
		 * get auth data from header
		 * */
		 function getAuthorizationHeader(){
		    $headers = null;
		    if (isset($_SERVER['Authorization'])) {
		        $headers = trim($_SERVER["Authorization"]);
		    }
		    else if (isset($_SERVER['HTTP_AUTHORIZATION'])) { //Nginx or fast CGI
		        $headers = trim($_SERVER["HTTP_AUTHORIZATION"]);
		    } elseif (function_exists('apache_request_headers')) {
		        $requestHeaders = apache_request_headers();
		        // Server-side fix for bug in old Android versions (a nice side-effect of this fix means we don't care about capitalization for Authorization)
		        $requestHeaders = array_combine(array_map('ucwords', array_keys($requestHeaders)), array_values($requestHeaders));
		        //print_r($requestHeaders);
		        if (isset($requestHeaders['Authorization'])) {
		            $headers = trim($requestHeaders['Authorization']);
		        }
		    }
		    return $headers;
		 }

		 /**
		 * get access token from header
		 * */
		 function getBearerToken() {
		    $headers = getAuthorizationHeader();
		    // HEADER: Get the access token from the header
		    if (!empty($headers)) {
		        if (preg_match('/Bearer\s(\S+)/', $headers, $matches)) {
		            return $matches[1];
		        }
		    }
		    return null;
		}