<?php
/**
 * 身份证工具类
 *
 * @author Tongle Xu <xutongle@gmail.com> 2013-6-6
 * @copyright Copyright (c) 2003-2103 tintsoft.com
 * @license http://www.php100.com
 * @version $Id$
 */
class Utils_Idcard {
	/**
	 * 中国公民身份证号码最小长度。
	 */
	const CHINA_ID_MIN_LENGTH = 15;

	/**
	 * 中国公民身份证号码最大长度。
	 */
	const CHINA_ID_MAX_LENGTH = 18;

	/**
	 * 最低年限
	 */
	const MIN = 1930;

	/**
	 * 省、直辖市代码表
	 */
	public static $cityCode = array ("11","12","13","14","15","21","22","23","31","32","33","34","35","36","37","41","42","43","44","45","46","50","51","52","53","54","61","62","63","64","65","71","81","82","91" );

	/**
	 * 每位加权因子
	 */
	public static $power = array (7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2 );

	/**
	 * 第18位校检码
	 */
	public static $verifyCode = array ("1","0","X","9","8","7","6","5","4","3","2" );
	/**
	 * 国内身份证校验
	 */
	public static $cityCodes = array ('11' => '北京' );

	/**
	 * 将15位身份证号码转换为18位
	 *
	 * @param idCard 15位身份编码
	 * @return 18位身份编码
	 */
	public static function conver15CardTo18($idCard) {
		$idCard18 = "";
		if (strlen ( $idCard ) != self::CHINA_ID_MIN_LENGTH) {
			return null;
		}
		if (self::isNum ( $idCard )) {
			// 获取出生年月日
			$sYear = '19' . substr ( $idCard, 6, 2 );
			$idCard18 = substr ( $idCard, 0, 6 ) . $sYear . substr ( $idCard, 8 );
			// 转换字符数组
			$iArr = str_split ( $idCard18 );
			if ($iArr != null) {
				$iSum17 = self::getPowerSum ( $iArr );
				// 获取校验位
				$sVal = self::getCheckCode18 ( $iSum17 );
				if (strlen ( $sVal ) > 0) {
					$idCard18 .= $sVal;
				} else {
					return null;
				}
			}
		} else {
			return null;
		}
		return $idCard18;
	}

	/**
	 * 验证身份证是否合法
	 */
	public static function validateCard($idCard) {
		$card = trim ( $idCard );
		if (self::validateIdCard18 ( $card )) {
			return true;
		}
		if (self::validateIdCard15 ( $card )) {
			return true;
		}
		return false;
	}

	/**
	 * 验证18位身份编码是否合法
	 *
	 * @param int $idCard 身份编码
	 * @return boolean 是否合法
	 */
	public static function validateIdCard18($idCard) {
		$bTrue = false;
		if (strlen ( $idCard ) == self::CHINA_ID_MAX_LENGTH) {
			// 前17位
			$code17 = substr ( $idCard, 0, 17 );
			// 第18位
			$code18 = substr ( $idCard, 17, 1 );
			if (self::isNum ( $code17 )) {
				$iArr = str_split ( $code17 );
				if ($iArr != null) {
					$iSum17 = self::getPowerSum ( $iArr );
					// 获取校验位
					$val = self::getCheckCode18 ( $iSum17 );
					if (strlen ( $val ) > 0 && $val == $code18) {
						$bTrue = true;
					}
				}
			}
		}
		return $bTrue;
	}

	/**
	 * 验证15位身份编码是否合法
	 *
	 * @param string $idCard 身份编码
	 * @return boolean 是否合法
	 */
	public static function validateIdCard15($idCard) {
		if (strlen ( $idCard ) != self::CHINA_ID_MIN_LENGTH) {
			return false;
		}
		if (self::isNum ( $idCard )) {
			$proCode = substr ( $idCard, 0, 2 );
			if (! isset ( self::$cityCodes [$proCode] )) {
				return false;
			}
			//升到18位
			$idCard = self::conver15CardTo18($idCard);
			return self::validateIdCard18($idCard);
		} else {
			return false;
		}
		return true;
	}

	/**
	 * 根据身份编号获取年龄
	 *
	 * @param string idCard 身份编号
	 * @return 年龄
	 */
	public static function getAgeByIdCard($idCard) {
		$iAge = 0;
		if (strlen ( $idCard ) == self::CHINA_ID_MIN_LENGTH) {
			$idCard = self::conver15CardTo18 ( $idCard );
		}
		$year = substr ( $idCard, 6, 4 );
		$iCurrYear = date ( 'Y', time () );
		$iAge = $iCurrYear - $year;
		return $iAge;
	}

	/**
	 * 根据身份编号获取生日天
	 *
	 * @param string $idCard 身份编号
	 * @return NULL string
	 */
	public static functi