<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 流年 <liu21st@gmail.com>
// +----------------------------------------------------------------------

/**
 * 定义常量
 */
$server_name = $_SERVER['SERVER_NAME'];
$server_name_html = "www" . substr($server_name, strpos($server_name, '.'));
define("URL", $server_name_html);
//国际化
define("LANG", ['zh-cn', 'en-us']);


/**
 * 获取request
 */
function requestInfo() {
    $requestInfo = \think\Request::instance();
    return $requestInfo;
}

/**
 * 获取header
 */
function headerInfo() {
    $requestInfo = requestInfo ();
    $headerInfo = $requestInfo->header();
    return $headerInfo;
}

/**
 * 随机盐值
 */
function GenEncryption() {
    // 生成随机数.
    srand((double) microtime() * 1000000);
    $ychar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
    $list = explode(",", $ychar);
    $authnum = "";
    for ($i = 0; $i < 6; $i++) {
        $randnum = rand(0, 61); // 10+26;
        $authnum .= $list[$randnum];
    }
    return $authnum;
}

/**
 * 密码加密
 */
function GenPassword($password) {
    $Enc = GenEncryption();
    $Pwd = md5(md5($Enc . $password));
    return array("encryption" => $Enc, "password" => $Pwd);
}

/**
 * 生成token
 *
 * @return string
 */
function getToken() {
    $enc = GenEncryption();
    $time = time();
    $token = substr(uniqid($enc . $time), 0, 35);
    return $token;
}

/**
 * UUID 生成
 */
function UUID() {
    $prefix = '';
    $str = md5(uniqid(mt_rand(), true));
    $uuid = substr($str, 0, 8) . '-';
    $uuid .= substr($str, 8, 4) . '-';
    $uuid .= substr($str, 12, 4) . '-';
    $uuid .= substr($str, 16, 4) . '-';
    $uuid .= substr($str, 20, 12);
    return $prefix . $uuid;
}

/**
 * 订单 生成
 */
function OrderID($prefix = '') {
    $num = mt_rand(100, 999);
    list($s, $m) = explode(' ', microtime());
    $order = date("YmdHis") . ($s * 1000000) . $num;
    return $prefix . $order;
}

/**
 * 获取客户端真实IP
 */
function GETIP() {
    global $ip;

    if (getenv("HTTP_CLIENT_IP")) {
        $ip = getenv("HTTP_CLIENT_IP");
    } else if (getenv("HTTP_X_FORWARDED_FOR")) {
        $ip = getenv("HTTP_X_FORWARDED_FOR");
    } else if (getenv("REMOTE_ADDR")) {
        $ip = getenv("REMOTE_ADDR");
    } else {
        $ip = "Unknow";
    }

    return $ip;

}

/**
 * 数据加密
 */
function lock_url($txt, $key)
{
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
    $nh = rand(0, 64);
    $ch = $chars[$nh];
    $mdKey = md5($key.$ch);
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);
    $txt = base64_encode($txt);
    $tmp = '';
    $i = 0;
    $j = 0;
    $k = 0;
    for ($i=0; $i<strlen($txt); $i++) {
        $k = $k == strlen($mdKey) ? 0 : $k;
        $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
        $tmp .= $chars[$j];
    }
    return urlencode($ch.$tmp);
}

/**
 * 数据解密
 */
function unlock_url($txt, $key)
{
    $txt = urldecode($txt);
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
    $ch = $txt[0];
    $nh = strpos($chars,$ch);
    $mdKey = md5($key.$ch);
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);
    $txt = substr($txt,1);
    $tmp = '';
    $i = 0;
    $j = 0;
    $k = 0;
    for ($i=0; $i<strlen($txt); $i++) {
        $k = $k == strlen($mdKey) ? 0 : $k;
        $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
        while ($j<0) $j+=64;
        $tmp .= $chars[$j];
    }
    return base64_decode($tmp);
}

/**
 * 分页
 */
function getPage($count, $pageSize, $currentPage)
{
    // 总页数.
    $allPage = ceil($count/$pageSize);
    $page = [];
    if ($allPage > 5) {
        // 判断开始页码.
        if ($currentPage <= 3) {
            $n = 1;
        } else if ($currentPage >= ($allPage - 2)) {
            $n = ($allPage - 4);
        } else {
            $n = ($currentPage - 2);
        }

        for ($i = 0; $i <= 4; $i++) {
            $page[$i] = $n;
            $n++;
        }
    } else {
        for ($i = 0; $i <= ($allPage - 1); $i++) {
            $page[$i] = $i + 1;
        }
    }

    return $page;
}

/**
 * CODE生成
 */
function getCode() {
    $format = 8;
    $dics = array(
        0=>'0',    1=>'1', 2=>'2', 3=>'3', 4=>'4', 5=>'5', 6=>'6', 7=>'7', 8=>'8',
        9=>'9', 10=>'A',  11=>'B', 12=>'C', 13=>'D', 14=>'E', 15=>'F',  16=>'G',  17=>'H',
        18=>'I',19=>'J',  20=>'K', 21=>'L',  22=>'M',  23=>'N', 24=>'O', 25=>'P', 26=>'Q',
        27=>'R',28=>'S',  29=>'T',  30=>'U', 31=>'V',  32=>'W',  33=>'X', 34=>'Y', 35=>'Z'
    );
    list($msec, $sec) = explode(' ', microtime());
    $msectime =  (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
    $int = substr($msectime,0,13);
    $dnum = 36; //进制数
    $arr = array ();
    $loop = true;
    while ($loop) {
        $arr[] = $dics[bcmod($int, $dnum)];
        $int = bcdiv($int, $dnum, 0);
        if ($int == '0') {
            $loop = false;
        }
    }
    if (count($arr) < $format)
        $arr = array_pad($arr, $format, $dics[0]);

    return implode('', array_reverse($arr));
}

/**
 * 生成随机密码
 */
function randomPassword($len = 32, $keyword = '') {

    if (strlen($keyword) > $len) {//关键字不能比总长度长

        return false;

    }

    $str = '';

    $chars = 'abcdefghijkmnpqrstuvwxyz23456789ABCDEFGHIJKMNPQRSTUVWXYZ'; //去掉1跟字母l防混淆

    if ($len > strlen($chars)) {//位数过长重复字符串一定次数

        $chars = str_repeat($chars, ceil($len / strlen($chars)));

    }

    $chars = str_shuffle($chars); //打乱字符串

    $str = substr($chars, 0, $len);

    if (!empty($keyword)) {

        $start = $len - strlen($keyword);

        $str = substr_replace($str, $keyword, mt_rand(0, $start), strlen($keyword)); //从随机位置插入关键字

    }

    return $str;

}