getRelativeVersion() public method

Returns the version with the specified offset to the specified version.
public getRelativeVersion ( $version, $delta ) : string | null
return string | null A version string, or null if the specified version is unknown or the specified delta is not within the list of available versions.
 public function getRelativeVersion($version, $delta)
 {
     $this->doRegister();
     return parent::getRelativeVersion($version, $delta);
 }