Validate Estonian National code

isikukood.php

<?php
/*
* Validate Estonian national identification code.
*
* Copyright (c) 2020 Ali Hakami
* port from @author Mika Tuupola (javascript)
* https://gist.github.com/tuupola/180321
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
* @param string $code estonian national code
* @return boolean is valid or not
*/
public function nationalCodeisValid($code){
      //$multiplier_1 = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 1);
      //$multiplier_2 = array(3, 4, 5, 6, 7, 8, 9, 1, 2, 3);

      $control = intval(substr($code,-1));
      $retval  = false;

      $mod  = 0;
      $total = 0;

      /* Do first run. */
      for ($i=-1; $i < 9; $i++) {
          $total += intval($code[$i]) * ((($i+1)%9)+1);
      }
      $mod = $total % 11;

      /* If modulus is ten we need second run. */
      $total = 0;
      if ($mod == 10) {
        for ($i=1; $i < 11; $i++) {
            $total += intval($code[$i]) * ((($i+1)%9)+1);
        }
        $mod = $total % 11;

        /* If modulus is still ten revert to 0. */
        if (10 == $mod) {
            $mod = 0;
        }
      }
      return $control == $mod;
    }

ported from JavaScript:
https://gist.github.com/tuupola/180321

Thanks @vishalkvl.
I have Modified The Code as You Suggest.