PHP校验15位和18位身份证号的类封装

class IDCardFilter
{
  /**
   * 身份证号码校验
   *
   * @param string $idCard
   * @return bool
   */
  public function vaild($idCard)
  {
    // 基础的校验，校验身份证格式是否正确
    if (!$this->isCardNumber($idCard)) {
      return false;
    }

    // 将 15 位转换成 18 位
    $idCard = $this->fifteen2Eighteen($idCard);

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

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

    // 检查校验码
    return $this->checkCode($idCard);
  }
}

/**
 * 检测是否是身份证号码
 *
 * @param string $idCard
 * @return boolean
 */
public function isCardNumber($idCard)
{
  return preg_match(self::REGX, $idCard);
}

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

  // 如果身份证顺序码是996 997 998 999，这些是为百岁以上老人的特殊编码
  // $code = array_search(substr($idCard, 12, 3), [996, 997, 998, 999]) !== false ? \'18\' : \'19\';
  // 一般 19 就够了
  $code = \'19\';
  $idCard  = substr($idCard, 0, 6) . $code . substr($idCard, 6, 9);
  return $idCard  . $this->genCode($idCard );
}

/**
 * 生成校验码
 *
 * @param string $idCard 
 * @return void
 */
final protected function genCode($idCard )
{
  $idCardLength = strlen($idCard );
  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++) {
    $sum += substr($idCard , $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 => \"内蒙古\",
  21 => \"辽宁\", 22 => \"吉林\", 23 => \"黑龙江\", 31 => \"上海\", 32 => \"江苏\",
  33 => \"浙江\", 34 => \"安徽\", 35 => \"福建\",  36 => \"江西\", 37 => \"山东\", 41 => \"河南\",
  42 => \"湖北\", 43 => \"湖南\", 44 => \"广东\",  45 => \"广西\", 46 => \"海南\", 50 => \"重庆\",
  51 => \"四川\", 52 => \"贵州\", 53 => \"云南\",  54 => \"西藏\", 61 => \"陕西\", 62 => \"甘肃\",
  63 => \"青海\", 64 => \"宁夏\", 65 => \"新疆\",  71 => \"台湾\", 81 => \"香港\", 82 => \"澳门\", 91 => \"国外\"
];

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

/**
 * 检测生日是否正确
 *
 * @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);
}

/**
 * 校验码比对
 *
 * @param string $idCard
 * @return void
 */
public function checkCode($idCard)
{
  $idCard  = substr($idCard, 0, 17);
  $code = $this->genCode($idCard );
  return $idCard == ($idCard  . $code);
}