code: private function encodeBearer ($consumer_key, $consumer_secret){
  
          // Create Bearer Token as per Twitter recomends at 
          // https://dev.twitter.com/docs/auth/application-only-auth
          $consumer_key = rawurlencode($consumer_key);
          $consumer_secret = rawurlencode($consumer_secret);
          return base64_encode($consumer_key . ':' . $consumer_secret);
  
      }
docs: Encodes the Bearer according to twitter's standards
  @param  [string] $consumer_key    Your Twitter Application Consumer Key
  @param  [string] $consumer_secret Your Twitter Application Consumer Secret Key
  @return [string]                  Your encoded Twitter Bearer token credentials