Get a large Twitter profile image without having to deal with v1.1 API authentication.

get_twitter_profile_img

function get_twitter_profile_img($username) {
    $xml = simplexml_load_file('http://twitter.com/users/'.$username.'.xml');
    return str_replace('_normal', '', $xml->profile_image_url);
}

This should work as well:

function get_profile_image($username, $size = '') {
  $api_call = 'http://twitter.com/users/show/'.$username.'.json';
  $results = json_decode(file_get_contents($api_call));
  return str_replace('_normal', $size, $results->profile_image_url);
}