<?php

/**
 * 接口信息返回方法
 */
function apiReturn($code = 200, $msg = '', $data = [],$header = []){
    http_response_code($code);    //设置返回头部
    $return['code']   = (int)$code;
    $return['msg']    = $msg;
    $return['result'] = is_array($data) ? $data : ['info'=>$data];
    // 发送头部信息
    foreach ($header as $name => $val) {
        if (is_null($val)) {
            header($name);
        } else {
            header($name . ':' . $val);
        }
    }
    exit(json_encode($return,JSON_UNESCAPED_UNICODE));
}

function checknum($len = 6)
{
    $chars = array(
        "0",
        "1",
        "2",
        "3",
        "4",
        "5",
        "6",
        "7",
        "8",
        "9"
    );
    $charsLen = count($chars) - 1;
    shuffle($chars); // 将数组打乱
    $output = "";
    for ($i = 0; $i < $len; $i ++) {
        $output .= $chars[mt_rand(0, $charsLen)];
    }
    return $output;
}

/**
 * 根据身份证号码获取性别
 * 
 * @param string $string
 *            身份证号码
 * @return int $sex 性别 1男 2女 0未知
 *        
 */
function getsex($idcard)
{
    $sexint = (int) substr($idcard, 16, 1);
    return $sexint % 2 === 0 ? 2 : 1;
}

/**
 * 根据身份证号码获取生日
 * 
 * @param string $string
 *            身份证号码
 * @return string
 */
function getbirthday($idcard)
{
    $bir = substr($idcard, 6, 8);
    $year = (int) substr($bir, 0, 4);
    $month = (int) substr($bir, 4, 2);
    $day = (int) substr($bir, 6, 2);
    return $year . "-" . $month . "-" . $day;
}