Changes April 8th break PHP Twitter's verify credentials function. To fix this find the function (yes, it's spelled wrong) "verifyCrendentials"
then update the code from $response = $this->doCall('account/verify_credentials.xml', array(), true); to $response = $this->doCall('account/verify_credentials.xml', array(), true, false); This will switch from a POST request to a GET request, which is required.