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class IDCardFilter
{
  /**
   * 身份證號(hào)碼校驗(yàn)
   *
   * @param string $idCard
   * @return bool
   */
  public function vaild($idCard)
  {
    // 基礎(chǔ)的校驗(yàn)，校驗(yàn)身份證格式是否正確
    if (!$this->isCardNumber($idCard)) {
      return false;
    }

    // 將 15 位轉(zhuǎn)換成 18 位
    $idCard = $this->fifteen2Eighteen($idCard);

    // 檢查省是否存在
    if (!$this->checkProvince($idCard)) {
      return false;
    }

    // 檢查生日是否正確
    if (!$this->checkBirthday($idCard)) {
      return false;
    }

    // 檢查校驗(yàn)碼
    return $this->checkCode($idCard);
  }
}

/**
 * 檢測是否是身份證號(hào)碼
 *
 * @param string $idCard
 * @return boolean
 */
public function isCardNumber($idCard)
{
  return preg_match(self::REGX, $idCard);
}

/**
 * 15位轉(zhuǎn)18位
 *
 * @param string $idCard
 * @return void
 */
public function fifteen2Eighteen($idCard)
{
  if (strlen($idCard) != 15) {
    return $idCard;
  }

  // 如果身份證順序碼是996 997 998 999，這些是為百歲以上老人的特殊編碼
  // $code = array_search(substr($idCard, 12, 3), [996, 997, 998, 999]) !== false ? '18' : '19';
  // 一般 19 就夠了
  $code = '19';
  $idCardBase = substr($idCard, 0, 6) . $code . substr($idCard, 6, 9);
  return $idCardBase . $this->genCode($idCardBase);
}

/**
 * 生成校驗(yàn)碼
 *
 * @param string $idCardBase
 * @return void
 */
final protected function genCode($idCardBase)
{
  $idCardLength = strlen($idCardBase);
  if ($idCardLength != 17) {
    return false;
  }
  $factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
  $verifyNumbers = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];
  $sum = 0;
  for ($i = 0; $i < $idCardLength; $i++) {
    $sum += substr($idCardBase, $i, 1) * $factor[$i];
  }
  $index = $sum % 11;
  return $verifyNumbers[$index];
}

protected $provinces = [
  11 => "北京", 12 => "天津", 13 => "河北",  14 => "山西", 15 => "內(nèi)蒙古",
  21 => "遼寧", 22 => "吉林", 23 => "黑龍江", 31 => "上海", 32 => "江蘇",
  33 => "浙江", 34 => "安徽", 35 => "福建",  36 => "江西", 37 => "山東", 41 => "河南",
  42 => "湖北", 43 => "湖南", 44 => "廣東",  45 => "廣西", 46 => "海南", 50 => "重慶",
  51 => "四川", 52 => "貴州", 53 => "云南",  54 => "西藏", 61 => "陜西", 62 => "甘肅",
  63 => "青海", 64 => "寧夏", 65 => "新疆",  71 => "臺(tái)灣", 81 => "香港", 82 => "澳門", 91 => "國外"
];

/**
 * 檢查省份是否正確
 *
 * @param string $idCard
 * @return void
 */
public function checkProvince($idCard)
{
  $provinceNumber = substr($idCard, 0, 2);
  return isset($this->provinces[$provinceNumber]);
}

/**
 * 檢測生日是否正確
 *
 * @param string $idCard
 * @return void
 */
public function checkBirthday($idCard)
{
  $regx = '#^\d{6}(\d{4})(\d{2})(\d{2})\d{3}[0-9X]$#';
  if (!preg_match($regx, $idCard, $matches)) {
    return false;
  }
  array_shift($matches);
  list($year, $month, $day) = $matches;
  return checkdate($month, $day, $year);
}

/**
 * 校驗(yàn)碼比對(duì)
 *
 * @param string $idCard
 * @return void
 */
public function checkCode($idCard)
{
  $idCardBase = substr($idCard, 0, 17);
  $code = $this->genCode($idCardBase);
  return $idCard == ($idCardBase . $code);
}