Expired timestamp, yours 1268263276, ours 1283976860
<hr />
OAuthRequest Object
(
    [parameters:OAuthRequest:private] => Array
        (
            [oauth_version] => 1.0
            [oauth_nonce] => e57c87c0d6f28d38bcc900f3534c5e1f
            [oauth_timestamp] => 1268263276
            [oauth_consumer_key] => key
            [method] => foo%20bar
            [bar] => baz
            [oauth_token] => accesskey
            [oauth_signature_method] => HMAC-SHA1
            [oauth_signature] => FJm8nDEDuuEPsCdlqcKemDmjlDU=
        )

    [http_method:OAuthRequest:private] => GET
    [http_url:OAuthRequest:private] => http://an9.org/oauth/example/echo_api.php?oauth_version=1.0&oauth_nonce=e57c87c0d6f28d38bcc900f3534c5e1f&oauth_timestamp=1268263276&oauth_consumer_key=key&method=foo%2520bar&bar=baz&oauth_token=accesskey&oauth_signature_method=HMAC-SHA1&oauth_signature=FJm8nDEDuuEPsCdlqcKemDmjlDU%3D
    [base_string] => 
)