/**
* Convert between formats
*
* @author Marien den Besten
* @param integer $from_measure
* @param string $from_unit
* @param string $to_unit
* @param integer $round
* @return type
*/
private function convert($from_measure, $from_unit, $to_unit, $round = null)
{
if ($to_unit == $from_unit) {
//return if no conversion is needed
return !is_null($round) ? (string) round($from_measure, $round) : (string) $from_measure;
}
if (!array_key_exists($from_unit, $this->conversion_table) || !array_key_exists($to_unit, $this->conversion_table[$from_unit])) {
return 0;
}
//set precision
$round = is_null($round) ? 50 : $round;
return Utils::removeBcTrailingZeros(bcmul($from_measure, $this->conversion_table[$from_unit][$to_unit], $round));
}
