大陆身份证号处理类

包含大陆身份证号15位转18位、身份号有效性检查以及身份证信息提取。

use DateTime;
/**
 * 身份证号处理类
 * @author WeakSun
 */
class Idcard {

	static private $factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2),
			$verify = array(1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2),
			$info = array('status' => false, 'info' => '', 'data' => array());
	/**
	 * 验证身份证号码有效性
	 * @param string $idnum 身份证号码
	 * @return array
	 */
	public function index($idnum = null) {
		switch (strlen($idnum)) {
			case 18:
				break;
			case 15:
				$idnum = $this->upgrade($idnum);
				break;
			default :
				return $this->info(false, 'error', $idnum);
		}
		$info = $this->getInfo($idnum);
		$info['status'] = $this->getCode($idnum) == strtoupper(substr($idnum, -1));
		return $info;
	}

	/**
	 * 获取身份证信息
	 * @param string $idnum 身份证号码
	 * @return array
	 */
	public function getInfo($idnum) {
		$data = array(
			'id' => $idnum,
			'city' => substr($idnum, 0, 6),
			'birthday' => substr($idnum, 6, 4) . '-' . substr($idnum, 10, 2) . '-' . substr($idnum, 10, 2),
			'sex' => substr($idnum, -2, 1) % 2 ? '男' : '女'
		);
		$datetime = new DateTime($data['birthday']);
		$data['age'] = $datetime->diff(date_create())->format('%y');
		return $this->info(true, null, $data);
	}

	/**
	 * 15位号码升级18位
	 * @param string $idnum
	 * @return array
	 */
	public function upgrade($idnum) {
		if (strlen($idnum) != 15) {
			$this->info(true, null, $idnum);
		} else {
			$idnum = array(substr($idnum, 0, 6), 19, substr($idnum, 6));
			substr($idnum, -3) > 995 && $idnum[1] --;
			$idnum = implode('', $idnum);
		}
		return $this->info(true, null, $idnum . $this->getCode($idnum));
	}

	/**
	 * 获取确认码
	 * @param string $idnum 身份证号码
	 * @return string 成功返回确认码，失败返回false
	 */
	protected function getCode($idnum) {
		$code = 0;
		foreach (str_split($idnum) as $k => $v) {
			$code += $v * static::$factor[$k];
		}
		$index = $code % 11;
		return static::$verify[$index];
	}

	protected function info($status, $msg = null, $data = null) {
		$info = static::$info;
		empty($msg) || $info['info'] = $msg;
		empty($data) || $info['data'] = $data;
		if(is_array($status)){
			$this->info = array_merge($info, $status);
		}elseif(is_bool($status)){
			$info['status'] = $status;
		}
		return $this->info;
	}

}