我剛剛更新了phpexcel，phpspreadsheet我注意到彈出了這個錯誤：ErrorException (E_DEPRECATED) 不推薦使用帶大括號的數組和字符串偏移訪問語法需要“類/PHPExcel.php”；這是我的代碼的一部分，它觸發了上述錯誤：文件： project/public/Classes/PHPExcel/Shared/ZipStreamWrapper.php  public function stream_open($path, $mode, $options, &$opened_path)    {        // Check for mode        if ($mode{0} != 'r') { //Error Line            throw new PHPExcel_Reader_Exception('Mode ' . $mode . ' is not supported. Only read mode is supported.');        } 文件： project/public/Classes/PHPExcel.php/** PHPExcel root directory */if (!defined('PHPEXCEL_ROOT')) {    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/');    require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php'); //Error Line}文件： app/Http/Controllers/analyticsAuth/statement.old.phpuse PHPExcel_Reader_Excel2007;use PHPExcel; use PHPExcel_IOFactory;use ZipArchive;require 'Classes/PHPExcel.php'; //Error Line文件： project/public/Classes/PHPExcel/Autoloader.phpPHPExcel_Autoloader::Register();PHPExcel_Shared_ZipStreamWrapper::register(); //Error Lineif (ini_get('mbstring.func_overload') & 2) {    throw new Exception('Multibyte function overloading in PHP must be disabled for string functions (2).');}謝謝