public function thumbnail($size = 'full')
    {
        $thumb = wp_get_attachment_image_src(get_post_thumbnail_id($this->id()), $size);
        return isset($thumb[0]) ? $thumb[0] : '';
    }
public function thumbnail($size = 'full')
    {
        $thumb = wp_get_attachment_image_src(get_post_thumbnail_id($this->id()), $size);
        return isset($thumb[0]) ? $thumb[0] : '';
    }
public function thumbnail ( $ size = 'full' ) { $ thumb = wp_get_attachment_image_src ( get_post_thumbnail_id ( $ this -> id ( ) ) , $ size ) ; return isset ( $ thumb [ 0 ] ) ? $ thumb [ 0 ] : '' ; }
Retrieve the post's thumbnail

@access public
@global object $post
@param string $size (default: "full")
@return string
Retrieve the post s thumbnail