<?php

// 公共助手函数

use Symfony\Component\VarExporter\VarExporter;
use think\exception\HttpResponseException;
use think\Response;

if (!function_exists('isMobile')) {
    function isMobile() {
        // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
        if (isset($_SERVER['HTTP_X_WAP_PROFILE'])) {
            return true;
        }

        // 通过HTTP_USER_AGENT判断
        $userAgent = $_SERVER['HTTP_USER_AGENT'] ?? '';

        // 移动设备的关键词数组
        $mobileKeywords = [
            'mobile', 'android', 'samsung', 'htc', 'nokia', 'sony', 'ericsson', 'blackberry', 'iphone',
            'ipod', 'ipad', 'opera mini', 'opera mobi', 'symbian', 'iemobile', 'windows phone',
            'webos', 'kindle', 'tablet'
        ];

        // 将数组转换为正则表达式，忽略大小写
        $pattern = '/' . implode('|', $mobileKeywords) . '/i';
        if (preg_match($pattern, $userAgent)) {
            return true;
        }

        // 检查HTTP_ACCEPT，如果包含wap则可能是移动设备
        if (isset($_SERVER['HTTP_ACCEPT']) &&
            strpos(strtolower($_SERVER['HTTP_ACCEPT']), 'wap') !== false) {
            return true;
        }

        // 通过HTTP_PROFILE头信息判断
        if (isset($_SERVER['HTTP_PROFILE'])) {
            return true;
        }

        // 检查设备屏幕宽度（如果通过客户端设置，但不可靠，因为客户端可以不设置）
        // 这里不采用，因为通过User Agent已经可以覆盖大部分情况

        return false;
    }
}

/**
 * 快捷获取用户信息
 * @param $throwError 未登录是否抛出异常
 * @return null
 */
if (!function_exists('user_info')) {

    function user_info($throwError = false)
    {
        if (\app\common\library\Auth::instance()->isLogin()) {
            return \app\common\library\Auth::instance()->getUser();
        }
        if ($throwError) {
            throw new \app\common\exception\Exception('请先登录', 0,401);
        }
        return null;
    }
}

/**
 * 解析文件地址
 * @param $url 文件初始地址
 * @param $source 来源
 * @return string
 */
if (!function_exists('parse_file_url')) {


    function parse_file_url($url,$source)
    {
        if($source == 'alioss'){
            $config = \app\common\model\config\System::getConfig('alioss');
            $url = cdnurl($url,$config['cdnurl']);
        }elseif($source == 'alivod'){
            $url = \addons\alivod\library\Alivod::parseAliovdTag($url);
        }else{
            $config = require(MODULE_ROOT."/application/extra/upload.php");
            $url = cdnurl($url,$config['cdnurl']);
        }

        return $url;
    }
}


/**
 * 生成URL，统一生成方便管理
 * @param string $segment 路由信息字符串
 * @param array $params queryString
 * @param boolean $noredirect
 * @return string (./index.php?c=*&a=*&do=*&...)
 */
if (!function_exists('formatMediaTime')) {
    function formatMediaTime($seconds, $lng = 'en')
    {
        $hours = str_pad(floor($seconds / 3600), 2, '0', STR_PAD_LEFT);
        $minutes = str_pad(floor(($seconds % 3600) / 60), 2, '0', STR_PAD_LEFT);
        $remainingSeconds = str_pad(intval($seconds % 60), 2, '0', STR_PAD_LEFT);

        if ($minutes == '00') {
            $minutes = '00';
        }
        if ($hours == '00') {
            $hours = '00';
        }
        if ($remainingSeconds == '00') {
            $remainingSeconds = '00';
        }
        if ($lng == 'en') {
            if ($hours == '00') {
                return "{$minutes}:{$remainingSeconds}";
            } else {
                return "{$hours}:{$minutes}:{$remainingSeconds}";
            }
        } else {
            if ($hours == '00') {
                return "{$minutes}分{$remainingSeconds}秒";
            } else {
                return "{$hours}时{$minutes}分{$remainingSeconds}秒";
            }
        }
    }
}
/**
 * 生成URL，统一生成方便管理
 * @param string $segment 路由信息字符串
 * @param array $params queryString
 * @param boolean $noredirect
 * @return string (./index.php?c=*&a=*&do=*&...)
 */
if (!function_exists('url')) {
    function url($segment, $params = array(), $noredirect = false) {
        return murl($segment, $params, $noredirect);
    }
}

/**
 * 秒转小时
 * @param $second 秒
 * @param $decimals 保留小数长度
 * @return int|string
 */
if (!function_exists('secondToHours')) {
    function secondToHours($second,$decimals=2) {
        if(!$second){
            return 0;
        }
        return number_format($second / 60 / 60,$decimals );
    }
}

/**
 * 秒转分钟
 * @param $second 秒
 * @param $decimals 保留小数长度
 * @return int|string
 */
if (!function_exists('secondToMinute')) {
    function secondToMinute($second,$decimals=2) {
        if(!$second){
            return 0;
        }
        return number_format($second / 60 ,$decimals );
    }
}

/**
 * 获取Web端URL地址
 * @param string $segment 路由参数
 * @param array  $params  附加参数
 * @param boolean $contain_domain 是否包含域名
 * @return string
 */

if (!function_exists('wurl')) {
    function wurl($segment, $params = array(), $contain_domain = false)
    {
        global $_W, $_GPC;
        if (empty($params)) {
            $params = array();
        }
        $cad = explode('/', $segment);
        $controller = empty($cad[0]) ? '' : $cad[0];
        $action = empty($cad[1]) ? '' : $cad[1];
        $do = empty($cad[2]) ? '' : $cad[2];
        if ($contain_domain) {
            $url = $_W['siteroot'] . 'web/index.php?';
        } else {
            $url = './index.php?';
        }
        if (!empty($controller)) {
            $url .= "c={$controller}&";
        }
        if (!empty($action)) {
            $url .= "a={$action}&";
        }
        if (!empty($do)) {
            $url .= "do={$do}&";
        }
        if (!empty($params)) {
            $queryString = http_build_query($params, '', '&');
            $url .= $queryString;
        }

        return $url;
    }
}

if (!function_exists('murl')) {
    /**
     * 获取Mobile端URL地址
     *
     * @param string $segment    路由参数
     * @param array  $params     附加参数
     * @param bool   $noredirect 是否追加微信URl后缀
     */
    function murl($segment, $params = array(), $noredirect = true, $addhost = false) {
        global $_W;
        $cad = explode('/', $segment);
        $controller = empty($cad[0]) ? '' : $cad[0];
        $action = empty($cad[1]) ? '' : $cad[1];
        $do = empty($cad[2]) ? '' : $cad[2];
        if (!empty($addhost)) {
            $url = $_W['siteroot'];
        } else {
            $url = './';
        }
        $str = '';
        $url .= "index.php?i={$_W['uniacid']}{$str}&";
        if (!empty($controller)) {
            $url .= "c={$controller}&";
        }
        if (!empty($action)) {
            $url .= "a={$action}&";
        }
        if (!empty($do)) {
            $url .= "do={$do}&";
        }
        if (!empty($params)) {
            $queryString = http_build_query($params, '', '&');
            $url .= $queryString;
            if (false === $noredirect) {
                //加上后，表单提交无值
                $url .= '&wxref=mp.weixin.qq.com#wechat_redirect';
            }
        }

        return $url;
    }
}


/**
 * 网络请求
 * @param stirng $method 请求模式
 * @param stirng  $url请求网关
 * @param array $params 请求参数
 * @param stirng  $header 自定义头
 * @param boolean  $multi 文件上传
 * @return array
 */
if (!function_exists('http')) {
    function http( $method, $url,$params = [],$header = array(), $multi = false){

        $opts = array(
            CURLOPT_TIMEOUT        => 30,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_HTTPHEADER     => $header
        );
        /* 根据请求类型设置特定参数 */
        switch(strtoupper($method)){
            case 'GET':
                $opts[CURLOPT_URL] = $url . '?' . http_build_query($params);
                break;
            case 'POST':
                //判断是否传输文件
                $params = $multi ? $params : http_build_query($params);
                $opts[CURLOPT_URL] = $url;
                $opts[CURLOPT_POST] = 1;
                $opts[CURLOPT_POSTFIELDS] = $params;
                break;
            default:
                throw new Exception('不支持的请求方式！');
        }

        /* 初始化并执行curl请求 */
        $ch = curl_init();
        curl_setopt_array($ch, $opts);
        $data  = curl_exec($ch);
        $error = curl_error($ch);
        curl_close($ch);
        if($error) throw new Exception('请求发生错误：' . $error);
        return  $data;
    }
}


/**
 * 判断是否为微信浏览器
 * @return bool
 */
if (!function_exists('isWeixin')) {
    function isWeixin()
    {
        if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false) {
            return true;
        } else {
            return false;
        }
    }
}
/**
 * 获取本月过去的每一周的开始与结束的时间戳
 * @return array
 */
if (!function_exists('getPastWeeksOfMonth')) {
    function getPastWeeksOfMonth()
    {
        $firstDayOfMonth = strtotime(date('Y-m-01'));
        $currentDate = strtotime(date('Y-m-d'));

        $weekNumber = (int)date('W', $currentDate);
        $weeksPassed = $weekNumber - (int)date('W', $firstDayOfMonth);

        $result = array();

        for ($i = 0; $i <= $weeksPassed; $i++) {
            $weekStartDate = strtotime('+' . $i . ' weeks', $firstDayOfMonth);
            $weekEndDate = strtotime('+6 days', $weekStartDate);

            $result[] = array(
                'weekNumber' => ($weekNumber - $weeksPassed) + $i,
                'startDate' => $weekStartDate,
                'endDate' => $weekEndDate
            );
        }
        return $result;
    }
}

if (!function_exists('__')) {

    /**
     * 获取语言变量值
     * @param string $name 语言变量名
     * @param array  $vars 动态变量值
     * @param string $lang 语言
     * @return mixed
     */
    function __($name, $vars = [], $lang = '')
    {
        if (is_numeric($name) || !$name) {
            return $name;
        }
        if (!is_array($vars)) {
            $vars = func_get_args();
            array_shift($vars);
            $lang = '';
        }
        
        return \think\Lang::get($name, $vars, $lang);
    }
}

if (!function_exists('format_bytes')) {

    /**
     * 将字节转换为可读文本
     * @param int    $size      大小
     * @param string $delimiter 分隔符
     * @param int    $precision 小数位数
     * @return string
     */
    function format_bytes($size, $delimiter = '', $precision = 2)
    {
        $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
        for ($i = 0; $size >= 1024 && $i < 6; $i++) {
            $size /= 1024;
        }
        return round($size, $precision) . $delimiter . $units[$i];
    }
}

if (!function_exists('datetime')) {

    /**
     * 将时间戳转换为日期时间
     * @param int    $time   时间戳
     * @param string $format 日期时间格式
     * @return string
     */
    function datetime($time, $format = 'Y-m-d H:i:s')
    {
        $time = is_numeric($time) ? $time : strtotime($time);
        return date($format, $time);
    }
}

if (!function_exists('human_date')) {

    /**
     * 获取语义化时间
     * @param int $time  时间
     * @param int $local 本地时间
     * @return string
     */
    function human_date($time, $local = null)
    {
        return \fast\Date::human($time, $local);
    }
}

if (!function_exists('cdnurl')) {

    /**
     * 获取上传资源的CDN的地址
     * @param string  $url    资源相对地址
     * @param boolean $domain 是否显示域名 或者直接传入域名
     * @return string
     */
    function cdnurl($url, $domain = false)
    {
        $regex = "/^((?:[a-z]+:)?\/\/|data:image\/)(.*)/i";

        if($domain && is_string($domain)){
            $cdnurl = $domain;
        }else{
            $cdnurl = \think\Config::get('upload.cdnurl');
            //判断最后一个字符是不是“/”,如果是就去掉
            if(substr($cdnurl, -1) == '/'){
                $cdnurl = substr($cdnurl, 0, -1);
            }
        }
        
        $url = (preg_match($regex, $url) || ($cdnurl && stripos($url, $cdnurl) === 0)) ? $url : $cdnurl . $url;

        if ($domain && !preg_match($regex, $url)) {

            $domain = is_bool($domain) ? request()->domain() : $domain;
            $url = $domain . $url;
        }
        return $url;
    }
}


if (!function_exists('is_really_writable')) {

    /**
     * 判断文件或文件夹是否可写
     * @param string $file 文件或目录
     * @return    bool
     */
    function is_really_writable($file)
    {
        if (DIRECTORY_SEPARATOR === '/') {
            return is_writable($file);
        }
        if (is_dir($file)) {
            $file = rtrim($file, '/') . '/' . md5(mt_rand());
            if (($fp = @fopen($file, 'ab')) === false) {
                return false;
            }
            fclose($fp);
            @chmod($file, 0777);
            @unlink($file);
            return true;
        } elseif (!is_file($file) or ($fp = @fopen($file, 'ab')) === false) {
            return false;
        }
        fclose($fp);
        return true;
    }
}

if (!function_exists('rmdirs')) {

    /**
     * 删除文件夹
     * @param string $dirname  目录
     * @param bool   $withself 是否删除自身
     * @return boolean
     */
    function rmdirs($dirname, $withself = true)
    {
        if (!is_dir($dirname)) {
            return false;
        }
        $files = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($dirname, RecursiveDirectoryIterator::SKIP_DOTS),
            RecursiveIteratorIterator::CHILD_FIRST
        );

        foreach ($files as $fileinfo) {
            $todo = ($fileinfo->isDir() ? 'rmdir' : 'unlink');
            $todo($fileinfo->getRealPath());
        }
        if ($withself) {
            @rmdir($dirname);
        }
        return true;
    }
}

if (!function_exists('copydirs')) {

    /**
     * 复制文件夹
     * @param string $source 源文件夹
     * @param string $dest   目标文件夹
     */
    function copydirs($source, $dest)
    {
        if (!is_dir($dest)) {
            mkdir($dest, 0755, true);
        }
        foreach (
            $iterator = new RecursiveIteratorIterator(
                new RecursiveDirectoryIterator($source, RecursiveDirectoryIterator::SKIP_DOTS),
                RecursiveIteratorIterator::SELF_FIRST
            ) as $item
        ) {
            if ($item->isDir()) {
                $sontDir = $dest . DS . $iterator->getSubPathName();
                if (!is_dir($sontDir)) {
                    mkdir($sontDir, 0755, true);
                }
            } else {
                copy($item, $dest . DS . $iterator->getSubPathName());
            }
        }
    }
}

if (!function_exists('mb_ucfirst')) {
    function mb_ucfirst($string)
    {
        return mb_strtoupper(mb_substr($string, 0, 1)) . mb_strtolower(mb_substr($string, 1));
    }
}

if (!function_exists('addtion')) {

    /**
     * 附加关联字段数据
     * @param array $items  数据列表
     * @param mixed $fields 渲染的来源字段
     * @return array
     */
    function addtion($items, $fields)
    {
        if (!$items || !$fields) {
            return $items;
        }
        $fieldsArr = [];
        if (!is_array($fields)) {
            $arr = explode(',', $fields);
            foreach ($arr as $k => $v) {
                $fieldsArr[$v] = ['field' => $v];
            }
        } else {
            foreach ($fields as $k => $v) {
                if (is_array($v)) {
                    $v['field'] = isset($v['field']) ? $v['field'] : $k;
                } else {
                    $v = ['field' => $v];
                }
                $fieldsArr[$v['field']] = $v;
            }
        }
        foreach ($fieldsArr as $k => &$v) {
            $v = is_array($v) ? $v : ['field' => $v];
            $v['display'] = isset($v['display']) ? $v['display'] : str_replace(['_ids', '_id'], ['_names', '_name'], $v['field']);
            $v['primary'] = isset($v['primary']) ? $v['primary'] : '';
            $v['column'] = isset($v['column']) ? $v['column'] : 'name';
            $v['model'] = isset($v['model']) ? $v['model'] : '';
            $v['table'] = isset($v['table']) ? $v['table'] : '';
            $v['name'] = isset($v['name']) ? $v['name'] : str_replace(['_ids', '_id'], '', $v['field']);
        }
        unset($v);
        $ids = [];
        $fields = array_keys($fieldsArr);
        foreach ($items as $k => $v) {
            foreach ($fields as $m => $n) {
                if (isset($v[$n])) {
                    $ids[$n] = array_merge(isset($ids[$n]) && is_array($ids[$n]) ? $ids[$n] : [], explode(',', $v[$n]));
                }
            }
        }
        $result = [];
        foreach ($fieldsArr as $k => $v) {
            if ($v['model']) {
                $model = new $v['model'];
            } else {
                $model = $v['name'] ? \think\Db::name($v['name']) : \think\Db::table($v['table']);
            }
            $primary = $v['primary'] ? $v['primary'] : $model->getPk();
            $result[$v['field']] = isset($ids[$v['field']]) ? $model->where($primary, 'in', $ids[$v['field']])->column($v['column'], $primary) : [];
        }

        foreach ($items as $k => &$v) {
            foreach ($fields as $m => $n) {
                if (isset($v[$n])) {
                    $curr = array_flip(explode(',', $v[$n]));

                    $linedata = array_intersect_key($result[$n], $curr);
                    $v[$fieldsArr[$n]['display']] = $fieldsArr[$n]['column'] == '*' ? $linedata : implode(',', $linedata);
                }
            }
        }
        return $items;
    }
}

if (!function_exists('var_export_short')) {

    /**
     * 使用短标签打印或返回数组结构
     * @param mixed   $data
     * @param boolean $return 是否返回数据
     * @return string
     */
    function var_export_short($data, $return = true)
    {
        return var_export($data, $return);
        $replaced = [];
        $count = 0;

        //判断是否是对象
        if (is_resource($data) || is_object($data)) {
            return var_export($data, $return);
        }

        //判断是否有特殊的键名
        $specialKey = false;
        array_walk_recursive($data, function (&$value, &$key) use (&$specialKey) {
            if (is_string($key) && (stripos($key, "\n") !== false || stripos($key, "array (") !== false)) {
                $specialKey = true;
            }
        });
        if ($specialKey) {
            return var_export($data, $return);
        }
        array_walk_recursive($data, function (&$value, &$key) use (&$replaced, &$count, &$stringcheck) {
            if (is_object($value) || is_resource($value)) {
                $replaced[$count] = var_export($value, true);
                $value = "##<{$count}>##";
            } else {
                if (is_string($value) && (stripos($value, "\n") !== false || stripos($value, "array (") !== false)) {
                    $index = array_search($value, $replaced);
                    if ($index === false) {
                        $replaced[$count] = var_export($value, true);
                        $value = "##<{$count}>##";
                    } else {
                        $value = "##<{$index}>##";
                    }
                }
            }
            $count++;
        });

        $dump = var_export($data, true);

        $dump = preg_replace('#(?:\A|\n)([ ]*)array \(#i', '[', $dump); // Starts
        $dump = preg_replace('#\n([ ]*)\),#', "\n$1],", $dump); // Ends
        $dump = preg_replace('#=> \[\n\s+\],\n#', "=> [],\n", $dump); // Empties
        $dump = preg_replace('#\)$#', "]", $dump); //End

        if ($replaced) {
            $dump = preg_replace_callback("/'##<(\d+)>##'/", function ($matches) use ($replaced) {
                return isset($replaced[$matches[1]]) ? $replaced[$matches[1]] : "''";
            }, $dump);
        }

        if ($return === true) {
            return $dump;
        } else {
            echo $dump;
        }
    }
}

if (!function_exists('letter_avatar')) {
    /**
     * 首字母头像
     * @param $text
     * @return string
     */
    function letter_avatar($text)
    {
        $total = unpack('L', hash('adler32', $text, true))[1];
        $hue = $total % 360;
        list($r, $g, $b) = hsv2rgb($hue / 360, 0.3, 0.9);

        $bg = "rgb({$r},{$g},{$b})";
        $color = "#ffffff";
        $first = mb_strtoupper(mb_substr($text, 0, 1));
        $src = base64_encode('<svg xmlns="http://www.w3.org/2000/svg" version="1.1" height="100" width="100"><rect fill="' . $bg . '" x="0" y="0" width="100" height="100"></rect><text x="50" y="50" font-size="50" text-copy="fast" fill="' . $color . '" text-anchor="middle" text-rights="admin" dominant-baseline="central">' . $first . '</text></svg>');
        $value = 'data:image/svg+xml;base64,' . $src;
        return $value;
    }
}

if (!function_exists('hsv2rgb')) {
    function hsv2rgb($h, $s, $v)
    {
        $r = $g = $b = 0;

        $i = floor($h * 6);
        $f = $h * 6 - $i;
        $p = $v * (1 - $s);
        $q = $v * (1 - $f * $s);
        $t = $v * (1 - (1 - $f) * $s);

        switch ($i % 6) {
            case 0:
                $r = $v;
                $g = $t;
                $b = $p;
                break;
            case 1:
                $r = $q;
                $g = $v;
                $b = $p;
                break;
            case 2:
                $r = $p;
                $g = $v;
                $b = $t;
                break;
            case 3:
                $r = $p;
                $g = $q;
                $b = $v;
                break;
            case 4:
                $r = $t;
                $g = $p;
                $b = $v;
                break;
            case 5:
                $r = $v;
                $g = $p;
                $b = $q;
                break;
        }

        return [
            floor($r * 255),
            floor($g * 255),
            floor($b * 255)
        ];
    }
}

if (!function_exists('check_nav_active')) {
    /**
     * 检测会员中心导航是否高亮
     */
    function check_nav_active($url, $classname = 'active')
    {
        $auth = \app\common\library\Auth::instance();
        $requestUrl = $auth->getRequestUri();
        $url = ltrim($url, '/');
        return $requestUrl === str_replace(".", "/", $url) ? $classname : '';
    }
}

if (!function_exists('check_cors_request')) {
    /**
     * 跨域检测
     */
    function check_cors_request()
    {
        if (isset($_SERVER['HTTP_ORIGIN']) && $_SERVER['HTTP_ORIGIN']) {
            $info = parse_url($_SERVER['HTTP_ORIGIN']);
            $domainArr = explode(',', config('fastadmin.cors_request_domain'));
            $domainArr[] = request()->host(true);
            $domainArr[] = '*';
            if (in_array("*", $domainArr) || in_array($_SERVER['HTTP_ORIGIN'], $domainArr) || (isset($info['host']) && in_array($info['host'], $domainArr))) {
                header("Access-Control-Allow-Origin: " . $_SERVER['HTTP_ORIGIN']);
            } else {
                $response = Response::create('跨域检测无效', 'html', 403);
                throw new HttpResponseException($response);
            }

            header('Access-Control-Allow-Credentials: true');
            header('Access-Control-Max-Age: 86400');

            if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
                if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD'])) {
                    header("Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS");
                }
                if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS'])) {
                    header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");
                }
                $response = Response::create('', 'html');
                throw new HttpResponseException($response);
            }
        }
    }
}

if (!function_exists('xss_clean')) {
    /**
     * 清理XSS
     */
    function xss_clean($content, $is_image = false)
    {
        return \app\common\library\Security::instance()->xss_clean($content, $is_image);
    }
}

if (!function_exists('check_ip_allowed')) {
    /**
     * 检测IP是否允许
     * @param string $ip IP地址
     */
    function check_ip_allowed($ip = null)
    {
        $ip = is_null($ip) ? request()->ip() : $ip;
        $forbiddenipArr = config('site.forbiddenip');
        $forbiddenipArr = !$forbiddenipArr ? [] : $forbiddenipArr;
        $forbiddenipArr = is_array($forbiddenipArr) ? $forbiddenipArr : array_filter(explode("\n", str_replace("\r\n", "\n", $forbiddenipArr)));
        if ($forbiddenipArr && \Symfony\Component\HttpFoundation\IpUtils::checkIp($ip, $forbiddenipArr)) {
            $response = Response::create('请求无权访问', 'html', 403);
            throw new HttpResponseException($response);
        }
    }
}

if (!function_exists('build_suffix_image')) {
    /**
     * 生成文件后缀图片
     * @param string $suffix 后缀
     * @param null   $background
     * @return string
     */
    function build_suffix_image($suffix, $background = null)
    {
        $suffix = mb_substr(strtoupper($suffix), 0, 4);
        $total = unpack('L', hash('adler32', $suffix, true))[1];
        $hue = $total % 360;
        list($r, $g, $b) = hsv2rgb($hue / 360, 0.3, 0.9);

        $background = $background ? $background : "rgb({$r},{$g},{$b})";

        $icon = <<<EOT
        <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 512 512" style="enable-background:new 0 0 512 512;" xml:space="preserve">
            <path style="fill:#E2E5E7;" d="M128,0c-17.6,0-32,14.4-32,32v448c0,17.6,14.4,32,32,32h320c17.6,0,32-14.4,32-32V128L352,0H128z"/>
            <path style="fill:#B0B7BD;" d="M384,128h96L352,0v96C352,113.6,366.4,128,384,128z"/>
            <polygon style="fill:#CAD1D8;" points="480,224 384,128 480,128 "/>
            <path style="fill:{$background};" d="M416,416c0,8.8-7.2,16-16,16H48c-8.8,0-16-7.2-16-16V256c0-8.8,7.2-16,16-16h352c8.8,0,16,7.2,16,16 V416z"/>
            <path style="fill:#CAD1D8;" d="M400,432H96v16h304c8.8,0,16-7.2,16-16v-16C416,424.8,408.8,432,400,432z"/>
            <g><text><tspan x="220" y="380" font-size="124" font-family="Verdana, Helvetica, Arial, sans-serif" fill="white" text-anchor="middle">{$suffix}</tspan></text></g>
        </svg>
EOT;
        return $icon;
    }
}