PHP Generate CreditCard numbers

GenerateCreditCardUtility.php

<?php

//    1-number        GenerateCreditCardUtility::credit_card_number('visa');
//    many-numbers    GenerateCreditCardUtility::credit_card_numbers('visa',15,10);


class GenerateCreditCardUtility{

 private $PrefixList       = [];

 function __construct(){

        $this->PrefixList['visa'][] =  "4539";
        $this->PrefixList['visa'][] =  "4556";
        $this->PrefixList['visa'][] =  "4916";
        $this->PrefixList['visa'][] =  "4532";
        $this->PrefixList['visa'][] =  "4929";
        $this->PrefixList['visa'][] =  "40240071";
        $this->PrefixList['visa'][] =  "4485";
        $this->PrefixList['visa'][] =  "4716";
        $this->PrefixList['visa'][] =  "4";

        $this->PrefixList['mastercard'][] =  "51";
        $this->PrefixList['mastercard'][] =  "52";
        $this->PrefixList['mastercard'][] =  "53";
        $this->PrefixList['mastercard'][] =  "54";
        $this->PrefixList['mastercard'][] =  "55";

        $this->PrefixList['amex'][] =  "34";
        $this->PrefixList['amex'][] =  "37";

        $this->PrefixList['discover'][] = "6011";

        $this->PrefixList['diners'][] =  "300";
        $this->PrefixList['diners'][] =  "301";
        $this->PrefixList['diners'][] =  "302";
        $this->PrefixList['diners'][] =  "303";
        $this->PrefixList['diners'][] =  "36";
        $this->PrefixList['diners'][] =  "38";

        $this->RoutePrefixList['enroute'][] =  "2014";
        $this->RoutePrefixList['enroute'][] =  "2149";

        $this->PrefixList['jsb'][] =  "35";

        $this->PrefixList['voyager'][] = "8699";
    }

    private function getPrefixArray(){
        return $this->PrefixList;
    }

    /*
    'prefix' is the start of the CC number as a string, any number of digits.
    'length' is the length of the CC number to generate. Typically 13 or 16
    */
    private function completed_number($prefix, $length) {

        $ccnumber = $prefix;

        # generate digits

        while ( strlen($ccnumber) < ($length - 1) ) {
            $ccnumber .= rand(0,9);
        }

        # Calculate sum

        $sum = 0;
        $pos = 0;

        $reversedCCnumber = strrev( $ccnumber );

        while ( $pos < $length - 1 ) {

            $odd = $reversedCCnumber[ $pos ] * 2;
            if ( $odd > 9 ) {
                $odd -= 9;
            }

            $sum += $odd;

            if ( $pos != ($length - 2) ) {

                $sum += $reversedCCnumber[ $pos +1 ];
            }
            $pos += 2;
        }

        # Calculate check digit

        $checkdigit = (( floor($sum/10) + 1) * 10 - $sum) % 10;
        $ccnumber .= $checkdigit;

        return $ccnumber;
    }

    static function credit_card_numbers($prefix, $length, $howMany) {

        $generator = new self;

        if(!isset($generator->getPrefixArray()[$prefix])) throw new \Exception('Credit Card Prefix Unavailable');

        $prefixList = $generator->getPrefixArray()[$prefix];

        for ($i = 0; $i < $howMany; $i++) {

            $ccnumber = $prefixList[ array_rand($prefixList) ];
            $result[] = $generator->completed_number($ccnumber, $length);
        }

        return $result;
    }

    static function credit_card_number($prefix) {

        $length = ($prefix == 'amex')? 15 : 16;

        return self::credit_card_numbers($prefix,$length,1)[0];
    }

}