How to manually set the App id and secret?

[adiv-phpian]

How to override default consumer key and secret?

[reliq]

You may do this via usingCredentials() method.

e.g.

// ...

$instance = Twitter::usingCredentials($accessToken, $accessTokenSecret, $consumerKey, $consumerSecret);

// subsequent calls on $instance methods will use the new config

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Ps. singleton issue is resolved in #352

[reliq]

I'll close this now. Please let us know if you have further issues.