The value (in feet) to convert.
The original type to convert from. Either 'ft' (feet, default) or 'mi' (miles, in which case the result is in km (metric))
An array containing the converted value in index 0 and the new unit key in index 1 (for use in PF1.measureUnits, for example)
Converts feet to what the world is using as a measurement unit.
Example