Queste costanti sono definite da questa estensione e sono disponibili solo se l'estensione è stata compilata nel PHP o se è stata caricata dinamicamente a runtime.
Most of these constants involve problems, which are also described within the official OAuth » Problem Reporting documentation. Note however, that these constant names are specific to PHP, although the naming scheme is similar.
OAUTH_SIG_METHOD_RSASHA1
     (string)
    OAUTH_SIG_METHOD_HMACSHA1
     (string)
    OAuth HMAC-SHA1 signature method.
OAUTH_SIG_METHOD_HMACSHA256
     (string)
    
      This constant represents putting OAuth parameters in the
      Authorization header.
     
OAUTH_AUTH_TYPE_NONE
     (string)
    This constant indicates a NoAuth OAuth request.
OAUTH_AUTH_TYPE_URI
     (string)
    This constant represents putting OAuth parameters in the request URI.
OAUTH_AUTH_TYPE_FORM
     (string)
    This constant represents putting OAuth parameters as part of the HTTP POST body.
OAUTH_HTTP_METHOD_GET
     (string)
    Use the GET method for the OAuth request.
OAUTH_HTTP_METHOD_POST
     (string)
    Use the POST method for the OAuth request.
OAUTH_HTTP_METHOD_PUT
     (string)
    Use the PUT method for the OAuth request.
OAUTH_HTTP_METHOD_HEAD
     (string)
    Use the HEAD method for the OAuth request.
OAUTH_HTTP_METHOD_DELETE
     (string)
    OAUTH_REQENGINE_STREAMS
     (int)
    OAUTH_REQENGINE_CURL for 
      Curl.
     
    OAUTH_REQENGINE_CURL
     (int)
    OAUTH_REQENGINE_STREAMS for PHP streams.
     
    OAUTH_OK
     (int)
    OAUTH_BAD_NONCE
     (int)
    OAUTH_BAD_TIMESTAMP
     (int)
    OAUTH_CONSUMER_KEY_UNKNOWN
     (int)
    OAUTH_CONSUMER_KEY_REFUSED
     (int)
    OAUTH_INVALID_SIGNATURE
     (int)
    OAUTH_TOKEN_USED
     (int)
    OAUTH_TOKEN_EXPIRED
     (int)
    OAUTH_TOKEN_REVOKED
     (int)
    OAUTH_TOKEN_REJECTED
     (int)
    OAUTH_VERIFIER_INVALID
     (int)
    OAUTH_PARAMETER_ABSENT
     (int)
    OAUTH_SIGNATURE_METHOD_REJECTED
     (int)
    