/**

• 身份证处理类
  */
  class IDCard {

//检证身份证是否正确
public static function isCard($card) {
$card = self::to18Card($card);
if (strlen($card) != 18) {
return false;
}

$cardBase = substr($card,17);

return (self::getVerifyNum($cardBase) == strtoupper(substr($card,17,1)));
}

//格式化15位身份证号码为18位
public static function to18Card($card) {
$card = trim($card);

if (strlen($card) == 18) {
return $card;
}

if (strlen($card) != 15) {
return false;
}

// 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
if (array_search(substr($card,12,3),array('996','997','998','999')) !== false) {
$card = substr($card,6) . '18' . substr($card,6,9);
} else {
$card = substr($card,6) . '19' . substr($card,9);
}
$card = $card . self::getVerifyNum($card);
return $card;
}

// 计算身份证校验码，根据国家标准gb 11643-1999
private static function getVerifyNum($cardBase) {
if (strlen($cardBase) != 17) {
return false;
}
// 加权因子
$factor = array(7,9,10,5,8,4,2,1,3,7,2);

// 校验码对应值
$verify_number_list = array('1','0','X','9','8','7','6','5','4','3','2');

$checksum = 0;
for ($i = 0; $i < strlen($cardBase); $i++) {
$checksum += substr($cardBase,$i,1) * $factor[$i];
}

$mod = $checksum % 11;
$verify_number = $verify_number_list[$mod];

return $verify_number;
}
}
?>