Поставил apache. Делал как написано Тут
Но когда перехожу на localhost, то вместо открытии php файлов, у меня браузер просит сохранить его. Помогите пожалуйста

Не самая хорошая дока, попробуй еще погуглить.

14. Edit your httpd.conf to load the PHP module. The path on the right hand
side of the LoadModule statement must point to the path of the PHP
module on your system. The make install from above may have already
added this for you, but be sure to check.

For PHP 4:

LoadModule php4_module путь/к/libphp4.so

For PHP 5:

LoadModule php5_module путь/к/libphp5.so

15. And in the AddModule section of httpd.conf, somewhere under the
ClearModuleList, add this:

For PHP 4:

AddModule mod_php4.c

For PHP 5:

AddModule mod_php5.c

16. Tell Apache to parse certain extensions as PHP. For example,
let's have Apache parse the .php extension as PHP. You could
have any extension(s) parse as PHP by simply adding more, with
each separated by a space. We'll add .phtml to demonstrate.

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

Edit your httpd.conf to load the PHP module. The path on the right hand side of the LoadModule statement must point to the path of the PHP module on your system. The make install from above may have already added this for you, but be sure to check.

LoadModule php5_module путь/к/libphp5.so

Tell Apache to parse certain extensions as PHP. For example, let's have Apache parse .php files as PHP. Instead of only using the Apache AddType directive, we want to avoid potentially dangerous uploads and created files such as exploit.php.jpg from being executed as PHP. Using this example, you could have any extension(s) parse as PHP by simply adding them. We'll add .php to demonstrate.

<FilesMatch \.php$>
SetHandler application/x-httpd-php
</FilesMatch>

Or, if we wanted to allow .php, .php2, .php3, .php4, .php5, .php6, and .phtml files to be executed as PHP, but nothing else, we'd use this:

<FilesMatch "\.ph(p[2-6]?|tml)$">
SetHandler application/x-httpd-php
</FilesMatch>
And to allow .phps files to be handled by the php source filter, and displayed as syntax-highlighted source code, use this:

<FilesMatch "\.phps$">
SetHandler application/x-httpd-php-source
</FilesMatch>