"Beginner php" input localhost/php file name How to upload this file prompt ah how to solve it

"Beginner php" input localhost/php file name How to download the file tips ah? How to solve it?
I was just beginning to learn PHP, look at the php100 video, after the Apache configuration, the video in the Apache htdocs file added a a.php file, then the php file was edited, the video input localhost/ A.php can display the relevant file information, how can I do when the download information?
I beg you to help, I base is too poor ~

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AddType application/x-httpd-php. php. phtml
Change into
AddType application/x-httpd-php. php. phtml

Give it a try

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PHP has not been parsed!!!
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Explore

Reference:
AddType application/x-httpd-php. php. phtml
I have this sentence, but it doesn't matter.

------Solution--------------------
It's clear from the front that the PHP module was not successfully installed. The general is to add a sentence in the conf/httpd.conf file AddType application/x-httpd-php. php

The premise is that your PHP module is already installed on your computer. Strictly follow the tutorial to configure the general will not have a problem

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