(PECL OAuth >= 0.99.1)
OAuth::__construct — Create a new OAuth object
$consumer_key
   , string $consumer_secret
   [, string $signature_method = OAUTH_SIG_METHOD_HMACSHA1
   [, int $auth_type = 0
  ]] )Creates a new OAuth object
consumer_keyThe consumer key provided by the service provider.
consumer_secretThe consumer secret provided by the service provider.
signature_method
       This optional parameter defines which signature method to use, by default it is OAUTH_SIG_METHOD_HMACSHA1 (HMAC-SHA1).
      
auth_type
       This optional parameter defines how to pass the OAuth parameters
       to a consumer, by default it is
       OAUTH_AUTH_TYPE_AUTHORIZATION (in the 
       Authorization header).