Unable to obtain file information when uploading in php

I use ajax to upload files to Php. All files within the operating range of the Php file size can be obtained. However, if I upload a 300M file, the PHP side cannot obtain anything. The print return information is as follows:
array( 0) {}
No Properties

How can we obtain file information or judge the file size without modifying the upload size of various configuration files such as PHP and browsers? Because I can’t get the files here, let alone determine the file size, please give me some advice!