original_string: private static function clean($msisdn)
      {
          $msisdn = preg_replace("/[^0-9]/", "", $msisdn);
  
          // We remove the 0 or 63 from the number
          if (substr($msisdn, 0, 1) == '0') {
              $msisdn = substr($msisdn, 1, strlen($msisdn));
          } else if (substr($msisdn, 0, 2) == '63') {
              $msisdn = substr($msisdn, 2, strlen($msisdn));
          }
  
          return $msisdn;
      }
code: private static function clean($msisdn)
      {
          $msisdn = preg_replace("/[^0-9]/", "", $msisdn);
  
          // We remove the 0 or 63 from the number
          if (substr($msisdn, 0, 1) == '0') {
              $msisdn = substr($msisdn, 1, strlen($msisdn));
          } else if (substr($msisdn, 0, 2) == '63') {
              $msisdn = substr($msisdn, 2, strlen($msisdn));
          }
  
          return $msisdn;
      }
code_tokens: private static function clean ( $ msisdn ) { $ msisdn = preg_replace ( "/[^0-9]/" , "" , $ msisdn ) ; // We remove the 0 or 63 from the number if ( substr ( $ msisdn , 0 , 1 ) == '0' ) { $ msisdn = substr ( $ msisdn , 1 , strlen ( $ msisdn ) ) ; } else if ( substr ( $ msisdn , 0 , 2 ) == '63' ) { $ msisdn = substr ( $ msisdn , 2 , strlen ( $ msisdn ) ) ; } return $ msisdn ; }
docstring: Cleans the string
  
  @param string $msisdn
  @return string The clean MSISDN
docstring_tokens: Cleans the string