During inheritance of Iterator: Uncaught think\exception\ErrorException: Return type of PHPExcel_WorksheetIterator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in D:\phpstudy_pro\WWW\tp_cGbCnn\tp\vendor\phpoffice\phpexcel\Classes\PHPExcel\WorksheetIterator.php:76
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