lib/Tumblr/API/Client.php
public function editPost($blogName, $postId, $data)
    {
        $data['id'] = $postId;
        $path = $this->blogPath($blogName, '/post/edit');

        return $this->postRequest($path, $data, false);
    }
public function editPost($blogName, $postId, $data)
    {
        $data['id'] = $postId;
        $path = $this->blogPath($blogName, '/post/edit');

        return $this->postRequest($path, $data, false);
    }
Edit a post

@param string $blogName the name of the blog
@param int    $postId   the id of the post to edit
@param array  $data     the data to save

@return array the response array