Bitpay\Util\Util::guid PHP Метод

    public static function guid()
    {
        return sprintf('%s-%s-%s-%s-%s', bin2hex(openssl_random_pseudo_bytes(4)), bin2hex(openssl_random_pseudo_bytes(2)), bin2hex(openssl_random_pseudo_bytes(2)), bin2hex(openssl_random_pseudo_bytes(2)), bin2hex(openssl_random_pseudo_bytes(6)));
    }

 public function testGuid()
 {
     $guid = Util::guid();
     // ensure proper length
     $this->assertEquals(36, strlen($guid));
     // Make sure in proper format
     $guid = explode('-', $guid);
     $this->assertEquals(8, strlen($guid[0]));
     $this->assertEquals(4, strlen($guid[1]));
     $this->assertEquals(4, strlen($guid[2]));
     $this->assertEquals(4, strlen($guid[3]));
     $this->assertEquals(12, strlen($guid[4]));
 }