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;
  }