笔记：updateBatch + bin2url + isJson

是那么无聊，偶尔也会写到一些不那么常用又那么常用的小功能。。。

    /**
     * 批量更新
     *
     * @param string $table 表名
     * @param array $multipleData 要更新的数据
     * @param string $id 条件字段
     * @return bool
     */
    public function updateBatch($table, array $multipleData = [], string $id = 'id')
    {
        if (!$multipleData) {
            return false;
        }

        try {
            $first = current($multipleData);
            $updateColumn = array_keys($first);
            $whereKey = !isset($first[$id]) ? 'id' : current($updateColumn);
            unset($updateColumn[0]);
            $updateSql = "UPDATE " . $table . " SET ";
            $sets = [];
            $bindings = [];
            foreach ($updateColumn as $uColumn) {
                $setSql = "`" . $uColumn . "` = CASE ";
                foreach ($multipleData as $data) {
                    $setSql .= "WHEN `" . $whereKey . "` = ? THEN ? ";
                    $bindings[] = $data[$whereKey];
                    $bindings[] = $data[$uColumn];
                }
                $setSql .= "ELSE `" . $uColumn . "` END ";
                $sets[] = $setSql;
            }
            $updateSql .= implode(', ', $sets);
            $whereIn = collect($multipleData)->pluck($whereKey)->values()->all();
            $bindings = array_merge($bindings, $whereIn);
            $whereIn = rtrim(str_repeat('?,', count($whereIn)), ',');
            $updateSql = rtrim($updateSql, ", ") . " WHERE `" . $whereKey . "` IN (" . $whereIn . ")";

//            DB::enableQueryLog();
            DB::update($updateSql, $bindings);
//            $log = DB::getQueryLog();
//            Log::info('queryLog:', $log);
            return true;
        } catch (\Exception $e) {
            Log::info("update error:" . $e->getMessage());
            return false;
        }
    }

    /**
     * 文件二进制数据
     *      注意：一般传输的文件数据为base64编码过的二进制数据，需先解码处理
     *
     * @param $binFileData
     * @return string
     * @throws \Exception
     */
    public function bin2url($binFileData)
    {
        $name = microtime(true) * 10000;
        $tmpPath = storage_path($name);
        file_put_contents($tmpPath, $binFileData);
        $fileTypes = [255216 => 'jpg', 7173 => 'gif', 13780    => 'png'];
        $fp = fopen($tmpPath, 'rb');
        $bin = fread($fp, 2);
        fclose($fp);
        unlink($tmpPath);

        $strInfo = unpack("C2chars", $bin);
        $typeCode = intval($strInfo['chars1'] . $strInfo['chars2']);
        if (!isset($fileTypes[$typeCode])) {
            throw new \Exception('文件格式有误，需传递jpg，gif，png格式');
        }

        $newPath = storage_path($name . '.' . $fileTypes[$typeCode]);
        file_put_contents($newPath, $binFileData);

        return $newPath;
    }

/**
 * json 判断
 *
 * @param $str
 * @return bool
 */
if (!function_exists('isJson')) {
    function isJson($str)
    {
        $arr = @json_decode($str, true);
        if (is_null($arr) || !is_array($arr) || json_last_error() > 0) {
            return false;
        }

        return true;
    }
}

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