/**
Convert one type of unit to another type of unit
@param $val value to convert
@param $from unit to convert from (id)
@param $to unit to convert to (id)
@param $solid true if it is solid, false if not
@param $system system of both to and from, 'usa' or 'metric'
*/
function convertTo($val, $from, $to, $solid, $system)
{
global $SMObj, $LangUI, $DB_LINK, $g_rb_units;
// If it is a unit type that cannot be converted then just return it (unit, pinch, clove...)
if (in_array($to, $g_rb_units['static']) || in_array($from, $g_rb_units['static'])) {
return $val;
}
// If it can be converted, try...
$state = NULL;
if ($solid == $DB_LINK->true) {
$state = "dry";
} else {
$state = "wet";
}
$unitFrom = Units::getUnitInfo($from, $state, $system);
$unitTo = Units::getUnitInfo($to, $state, $system);
if ($unitFrom == NULL || $unitTo == NULL) {
// DEBUG: put this back in for warnings
//echo $LangUI->_('Warning: conversion failure while trying to convert from unit ID') . " '". $from . "' "
// . $LangUI->_('to unit ID') . " '". $to . "'<br />";
return -1;
} else {
return round($val * $unitFrom[0] / $unitTo[0] * 10000) / 10000;
}
}
