Twitter PHP - URL not encoded in tweet

I'm trying to post to Twitter using the Twitter PHP SDK twitter-async my tweets include a URL in them that doesn't seem to be getting encoded. How can I make the URLs show properly when tweeted?

I call this function in the SDK

function postTweet($tweet) {
  $this->twitterObj->post('/statuses/update.json', arra开发者_运维知识库y('status' => $tweet));            
}

There's not much to it really.

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In the end it was simply an issue with Twitter not recognizing my local URL as an url, when I tested changing to my production site it worked fine.