lib/Tumblr/API/Client.php
public function reblogPost($blogName, $postId, $reblogKey, $options = null)
    {
        $params = array('id' => $postId, 'reblog_key' => $reblogKey);
        $params = array_merge($options ?: array(), $params);
        $path = $this->blogPath($blogName, '/post/reblog');

        return $this->postRequest($path, $params, false);
    }
public function reblogPost($blogName, $postId, $reblogKey, $options = null)
    {
        $params = array('id' => $postId, 'reblog_key' => $reblogKey);
        $params = array_merge($options ?: array(), $params);
        $path = $this->blogPath($blogName, '/post/reblog');

        return $this->postRequest($path, $params, false);
    }
Reblog a post

@param string $blogName  the name of the blog
@param int    $postId    the id of the post
@param string $reblogKey the reblog key of the post
@param array  $options   the options for the call

@return array the response array