public function setAttribute($attribute, $value = null)
    {
        $this->attributes->set($attribute, $value);

        return $this;
    }
public function setAttribute($attribute, $value = null)
    {
        $this->attributes->set($attribute, $value);

        return $this;
    }
public function setAttribute ( $ attribute , $ value = null ) { $ this -> attributes -> set ( $ attribute , $ value ) ; return $ this ; }
Sets an attribute

@param string $attribute The name of an attribute
@param string $value     [optional] The value of an attribute

@return Tag
Sets an attribute