IsoCodes\Sedol::validate PHP Method

    public static function validate($value)
    {
        if (strlen($value) !== 7) {
            return false;
        }
        $char6 = substr($value, 0, 6);
        if (!preg_match('/^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}$/', $char6)) {
            return false;
        }
        $weight = [1, 3, 1, 7, 3, 9, 1];
        $sum = 0;
        for ($i = 0; $i < 6; ++$i) {
            $sum += $weight[$i] * intval($char6[$i], 36);
        }
        $check = (10 - $sum % 10) % 10;
        return $value === $char6 . $check;
    }

 /**
  * @param string $sedol
  *
  * @dataProvider getInvalidSedols
  */
 public function testInvalidSedol($sedol)
 {
     $this->assertFalse(Sedol::validate($sedol));
 }