/**
* Returns a valid unit. If the provided one is invalid, the default will be used.
*
* @since 0.6.2
*
* @param string $unit
*
* @return string
*/
public static function getValidUnit($unit = null)
{
global $egMapsDistanceUnit, $egMapsDistanceUnits;
// This ensures the value for $egMapsDistanceUnit is correct, and caches the result.
if (self::$validatedDistanceUnit === false) {
if (!array_key_exists($egMapsDistanceUnit, $egMapsDistanceUnits)) {
$units = array_keys($egMapsDistanceUnits);
$egMapsDistanceUnit = $units[0];
}
self::$validatedDistanceUnit = true;
}
if ($unit == null || !array_key_exists($unit, $egMapsDistanceUnits)) {
$unit = $egMapsDistanceUnit;
}
return $unit;
}
