libphonenumber\PhoneNumberDesc::setPossibleNumberPattern PHP Method

    public function setPossibleNumberPattern($value)
    {
        $this->hasPossibleNumberPattern = true;
        $this->possibleNumberPattern = $value;
        return $this;
    }

 /**
  * Processes a phone number description element from the XML file and returns it as a
  * PhoneNumberDesc. If the description element is a fixed line or mobile number, the general
  * description will be used to fill in the whole element if necessary, or any components that are
  * missing. For all other types, the general description will only be used to fill in missing
  * components if the type has a partial definition. For example, if no "tollFree" element exists,
  * we assume there are no toll free numbers for that locale, and return a phone number description
  * with "NA" for both the national and possible number patterns.
  *
  * @param PhoneNumberDesc $generalDesc generic phone number description that will be used to fill in missing
  * parts of the description
  * @param \DOMElement $countryElement XML element representing all the country information
  * @param string $numberType name of the number type, corresponding to the appropriate tag in the XML
  * file with information about that type
  * @return PhoneNumberDesc complete description of that phone number type
  */
 private static function processPhoneNumberDescElement(PhoneNumberDesc $generalDesc, \DOMElement $countryElement, $numberType)
 {
     $phoneNumberDescList = $countryElement->getElementsByTagName($numberType);
     $numberDesc = new PhoneNumberDesc();
     if ($phoneNumberDescList->length == 0 && !self::isValidNumberType($numberType)) {
         $numberDesc->setNationalNumberPattern("NA");
         $numberDesc->setPossibleNumberPattern("NA");
         return $numberDesc;
     }
     $numberDesc->mergeFrom($generalDesc);
     if ($phoneNumberDescList->length > 0) {
         $element = $phoneNumberDescList->item(0);
         $possiblePattern = $element->getElementsByTagName(self::POSSIBLE_NUMBER_PATTERN);
         if ($possiblePattern->length > 0) {
             $numberDesc->setPossibleNumberPattern($possiblePattern->item(0)->firstChild->nodeValue);
         }
         $validPattern = $element->getElementsByTagName(self::NATIONAL_NUMBER_PATTERN);
         if ($validPattern->length > 0) {
             $numberDesc->setNationalNumberPattern($validPattern->item(0)->firstChild->nodeValue);
         }
         if (!self::$liteBuild) {
             $exampleNumber = $element->getElementsByTagName(self::EXAMPLE_NUMBER);
             if ($exampleNumber->length > 0) {
                 $numberDesc->setExampleNumber($exampleNumber->item(0)->firstChild->nodeValue);
             }
         }
     }
     return $numberDesc;
 }