Php-how to make Apche parse PHP statements in HTML files?

As the question, searched on the Internet a lot of solutions, such as in httpd. conf to add the following two lines of code: AddTypeapplicationx-httpd-php.html.htm.php.phtmlAddTypeapplicationx-httpd-php-source.html.htm.phps and then restart, access the html file, directly appear is download prompt box? Please answer! Very grateful! Phphtmlapache

For example, I found a lot of solutions on the Internet, such as adding the following two lines of code to httpd. conf:
AddType application/x-httpd-php. html. htm. php. phtml

AddType application/x-httpd-php-source. html. htm. phps
Then restart and access the html file. what is the download prompt box? Please answer! Very grateful!