function units_converters_temperature in Units of Measurement 7

Units convert callback for temperature measures.

Convert temperature between different units of measurement.

Parameters

float $value: Value in $from units that should be converted into $to units

Entity $from: Units entity in which $value is represented

Entity $to: Units entity into which $value should be converted

Return value

float $value converted into $to units

1 string reference to 'units_converters_temperature'

temperature.inc in plugins/converters/temperature.inc

File

plugins/converters/temperature.inc, line 29

Code

function units_converters_temperature($value, $from, $to) {
  $case = $from->machine_name . '_' . $to->machine_name;
  switch ($case) {
    case 'celsius_fahrenheit':
      return $value * (9 / 5) + 32;
      break;
    case 'celsius_kelvin':
      return $value + 273.15;
      break;
    case 'fahrenheit_kelvin':
      return ($value - 32) * (5 / 9) + 273.15;
      break;
    case 'fahrenheit_celsius':
      return ($value - 32) * (5 / 9);
      break;
    case 'kelvin_fahrenheit':
      return ($value - 273.15) * (9 / 5) + 32;
      break;
    case 'kelvin_celsius':
      return $value - 273.15;
      break;
  }

  // We are not supposed to fall through the switch above, so if we ever happen,
  // then something is wrong and we return a negative result.
  return FALSE;
}