如何修复错误（无法打开以进行读取！文件不存在）从输入文件中使用Codeigniter中的PHPExcel Api读取xlsx文件？

I'm getting error 500 when i try to read xlsx file using PHPExcel Api.

When i read file from input:

$objReader->load($_FILES['file']['tmp_name']);

=> it's not working. i get this error: Message: Could not open for reading! File does not exist.

However when i log $_FILES['file']['tmp_name'] i get the file path: C:\wamp64\tmp\xxxx.tmp

and when i try another file like this: $objReader->load('c://test.xlsx); it works

Controller:

$this->load->library('excel');
$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objPHPExcel = $objReader->load($_FILES['file']['tmp_name']);
print $objPHPExcel->getActiveSheet()->getCell('B1')->getValue();