* @param string|array $size Optional. Registered image size to use, or flat array of height
* and width values. Default 'post-thumbnail'.
* @param string|array $attr Optional. Query string or array of attributes. Default empty.
* @param string|array $size Optional. Registered image size to use, or flat array of height
* and width values. Default 'post-thumbnail'.
* @param string|array $attr Optional. Query string or array of attributes. Default empty.