E.164 Format phone Number, Convert to contry-code and Domestic phone number.

convertE164toDomestic.php

<?php
    var_dump(convertE164toDomestic("+81399999999");

    public static function convertFromE164($E164Number)
    {
        $contryLength = 1;

        $country = substr($E164Number, 1, $contryLength);
        switch ($country) {
            case '1':   $contryLength = 1;  break;
            case '7':   $contryLength = 1;  break;

            case '2':   $contryLength = 2;
                        $country = substr($E164Number, 1, $contryLength);

                        if($country === "20"
                        OR $country === "27")  break;
                        else {
                            $contryLength = 3;
                            $country = substr($E164Number, 1, $contryLength);
                        }
                        break;

            case '3':   $contryLength = 2;
                        $country = substr($E164Number, 1, $contryLength);

                        if($country === "30"
                        OR $country === "31"
                        OR $country === "32"
                        OR $country === "33"
                        OR $country === "34"
                        OR $country === "36" 
                        OR $country === "39")  break;
                        else {
                            $contryLength = 3;
                            $country = substr($E164Number, 1, $contryLength);
                        }
                        break;

            case '4':   $contryLength = 2;
                        $country = substr($E164Number, 1, $contryLength);

                        if($country === "40"
                        OR $country === "41"
                        OR $country === "43"
                        OR $country === "44"
                        OR $country === "45"
                        OR $country === "46"
                        OR $country === "47"
                        OR $country === "48"
                        OR $country === "49")  break;
                        else {
                            $contryLength = 3;
                            $country = substr($E164Number, 1, $contryLength);
                        }
                        break;

            case '5':   $contryLength = 2;
                        $country = substr($E164Number, 1, $contryLength);

                        if($country === "51"
                        OR $country === "52"
                        OR $country === "53"
                        OR $country === "54"
                        OR $country === "55"
                        OR $country === "56"
                        OR $country === "57"
                        OR $country === "58")  break;
                        else {
                            $contryLength = 3;
                            $country = substr($E164Number, 1, $contryLength);
                        }
                        break;

            case '6':   $contryLength = 2;
                        $country = substr($E164Number, 1, $contryLength);

                        if($country === "60"
                        OR $country === "61"
                        OR $country === "62"
                        OR $country === "63"
                        OR $country === "64"
                        OR $country === "65"
                        OR $country === "66")  break;
                        else {
                            $contryLength = 3;
                            $country = substr($E164Number, 1, $contryLength);
                        }
                        break;

            case '8':   $contryLength = 2;
                        $country = substr($E164Number, 1, $contryLength);

                        if($country === "81"
                        OR $country === "82"
                        OR $country === "84"
                        OR $country === "86")  break;
                        else {
                            $contryLength = 3;
                            $country = substr($E164Number, 1, $contryLength);
                        }
                        break;

            case '9':   $contryLength = 2;
                        $country = substr($E164Number, 1, $contryLength);

                        if($country === "90"
                        OR $country === "91"
                        OR $country === "92"
                        OR $country === "93"
                        OR $country === "94"
                        OR $country === "95"
                        OR $country === "98")  break;
                        else {
                            $contryLength = 3;
                            $country = substr($E164Number, 1, $contryLength);
                        }
                        break;
            default:
                $country = 0;
                $contryLength = 0;
                break;
        }
        
        unset($e164);
        $e164["contory"] = substr($E164Number, 1, $contryLength);
        $e164["telNumber"] = "0" . substr($E164Number, $contryLength + 1);
        
        return $e164;
    }