/**
* Appends the formatted extension of a phone number to formattedNumber, if the phone number had
* an extension specified.
*
* @param PhoneNumber $number
* @param PhoneMetadata|null $metadata
* @param int $numberFormat PhoneNumberFormat
* @param string $formattedNumber
*/
private function maybeAppendFormattedExtension(PhoneNumber $number, $metadata, $numberFormat, &$formattedNumber)
{
if ($number->hasExtension() && mb_strlen($number->getExtension()) > 0) {
if ($numberFormat === PhoneNumberFormat::RFC3966) {
$formattedNumber .= self::RFC3966_EXTN_PREFIX . $number->getExtension();
} else {
if (!empty($metadata) && $metadata->hasPreferredExtnPrefix()) {
$formattedNumber .= $metadata->getPreferredExtnPrefix() . $number->getExtension();
} else {
$formattedNumber .= self::DEFAULT_EXTN_PREFIX . $number->getExtension();
}
}
}
}