public function op_times($other)
{
if ($other instanceof SassColour) {
return $other->op_times($this);
} elseif (!$other instanceof SassNumber) {
throw new SassNumberException('Number must be a number', SassScriptParser::$context->node);
} else {
return new SassNumber($this->value * $other->value . $this->unitString(array_merge($this->numeratorUnits, $other->numeratorUnits), array_merge($this->denominatorUnits, $other->denominatorUnits)));
}
}