Custom SilverStripe PhoneNumberField

PhoneNumberField.php

<?php

/*
class MyDataObject extends DataObject {
    private static $db = [
    	'FoobarCountryCode' => 'Varchar',
        'FoobarAreaCode' => 'Varchar',
        'FoobarPhoneNumber' => 'Varchar',
        'FoobarExtension' => 'Varchar',
    ];
    public function getCMSFields() {
    	return new FieldList([
        	new MyPhoneNumberField('Foobar', 'Enter your phone number'),
        ]);
    }
}
*/

class MyPhoneNumberField extends PhoneNumberField { 
	public function saveInto(DataObjectInterface $record) {
		list( $countryCode, $areaCode, $phoneNumber, $extension ) = $this->parseValue();
		$fieldName = $this->name;
        	$record->{"{$fieldName}CountryCode"} = $countryCode;
        	$record->{"{$fieldName}AreaCode"} = $areaCode;
        	$record->{"{$fieldName}PhoneNumber"} = $phoneNumber;
        	$record->{"{$fieldName}Extension"} = $extension;
    }
}