403 Forbidden nginx/1.4.4 error occurred when accessing php file, how to solve it?

1. A 403 Forbidden
nginx/1.4.4 error occurred when accessing the Log in.php file through the server"s address and file path, resulting in the page not being displayed properly.
as shown in figure

clipboard.png
2.phpregist.php
3.

clipboard.png
4. The permissions for each child file are 644 and the permissions for the parent file are 755. But it still didn"t work.
5. How can I get the Log in.php file to display properly?

Mar.07,2021

says, why should login be opened with spaces?

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