Random.php

<?php
namespace Itx\Utilities ;

class Random
{
    public static function guid()
    {
        return sprintf(
            '%s-%04x-%04x-%04d-%s', 
            self::string(8), 
            mt_rand(0, 65535), 
            mt_rand(0, 65535), 
            self::digits(4) ,
            self::string(12)
        );
    }
    public static function string(int $length = 5)
    {
        $length = $length <= 0 ? 5 :  $length;
        return substr(
			bin2hex( self::bytes( $length * 2 ) )
		, 0 , $length) ;
    }
	public static function digits($length = 5)
	{
        $length = $length > 19 ? 19 : $length ;
        $start  = ("1".str_repeat("0" , $length - 1));
        $end    = str_repeat("9" , $length) ;

        return  mt_rand( (int) $start , (int) $end )  ;
    }
    public static function bytes($length = 5) 
	{
        if(function_exists("openssl_random_pseudo_bytes"))
        {
            return openssl_random_pseudo_bytes($length);
        }

		return random_bytes($length) ;
    }
}