lib/Github/Api/Issue/Labels.php
public function clear($username, $repository, $issue)
    {
        return $this->delete('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/issues/'.rawurlencode($issue).'/labels');
    }
public function clear($username, $repository, $issue)
    {
        return $this->delete('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/issues/'.rawurlencode($issue).'/labels');
    }
public function clear ( $ username , $ repository , $ issue ) { return $ this -> delete ( '/repos/' . rawurlencode ( $ username ) . '/' . rawurlencode ( $ repository ) . '/issues/' . rawurlencode ( $ issue ) . '/labels' ) ; }
Remove all labels from an issue.

@link https://developer.github.com/v3/issues/labels/#replace-all-labels-for-an-issue

@param string $username
@param string $repository
@param string $issue

@return array|string
Remove all labels from an issue .