RapidmodDataGenerator

<?php
/**
 * @author RapidMod.com
 * @author 813.330.0522
 * @version 0.0.1
 */


namespace Rapidmod\Data;


class Generator {

    public static $defaultStringLength = 16;


    protected static $rfcSecondaryKeys = array(8,9,"a","b");

    /**
     *
     * Name guid
     * @return
     * @return string  36-character string "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
     *  blocks of 8, 4, 4, 4 and 12 hex digits
     * @static static
     * @throws
     *
     * @author RapidMod.io
     * @author 813.330.0522
     *
     */
    public static function guid(){
        $c = self::randomString(16);
        $h = "-";
        return  substr($c, 0, 8).$h
                  .substr($c, 8, 4).$h
                  .substr($c,12, 4).$h
                  .substr($c,16, 4).$h
                  .substr($c,20,12);
    }

    public static function randomString($length){
        $length = (int)$length;
        if( $length < 1 ){ $length = (int)self::$defaultStringLength; }
        return bin2hex( random_bytes( $length ) );
        //return md5(bin2hex( random_bytes( $length ) ));
    }

    /**
     *
     * Name uuid
     * @return string  formatted for RFC 4122 36-character string "XXXXXXXX-XXXX-4XXX-(8,9,a,b)XXX-XXXXXXXXXXXX" see link below
     *  blocks of 8, 4, 4, 4 and 12 hex digits
     * @static static
     * @throws
     *
     * @author RapidMod.io
     * @author 813.330.0522
     *
     * @link  https://www.cryptosys.net/pki/uuid-rfc4122.html
     * @link http://www.ietf.org/rfc/rfc4122.txt
     */
    public static function uuid(){
        $c = self::randomString(16);
        $c[12] = 4;
        $x = random_int(0,3);
        $c[16] = self::$rfcSecondaryKeys[$x];
        $h = chr(45);
        return  substr($c, 0, 8).$h
                  .substr($c, 8, 4).$h
                  .substr($c,12, 4).$h
                  .substr($c,16, 4).$h
                  .substr($c,20,12);
    }

}