public static function getConversionGroups() {
		$conversionGroups = array();
		foreach(self::$_conversionUnits as $conversionUnit) {
			$conversionGroups[] = $conversionUnit['Group'];
		}
		return array_merge(array_unique($conversionGroups));
	}
public static function getConversionGroups() {
		$conversionGroups = array();
		foreach(self::$_conversionUnits as $conversionUnit) {
			$conversionGroups[] = $conversionUnit['Group'];
		}
		return array_merge(array_unique($conversionGroups));
	}
public static function getConversionGroups ( ) { $ conversionGroups = array ( ) ; foreach ( self :: $ _conversionUnits as $ conversionUnit ) { $ conversionGroups [ ] = $ conversionUnit [ 'Group' ] ; } return array_merge ( array_unique ( $ conversionGroups ) ) ; }
getConversionGroups
Returns a list of the different conversion groups for UOM conversions

@return	array
getConversionGroups Returns a list of the different conversion groups for UOM conversions