$template public property
The template used to render a single attribute. If a string, the token {label} and {value} will be replaced with the label and the value of the corresponding attribute. If a callback (e.g. an anonymous function), the signature must be as follows: function ($attribute, $index, $widget)
where $attribute refer to the specification of the attribute being rendered, $index is the zero-based index of the attribute in the $attributes array, and $widget refers to this widg