Install Apache and PHP on Mac OSX Sierra 10.13.6

Apache comes already installed, below steps to make sure it is running and also have PHP enabled:

1. Get in as root
sudo su

2. 
apachectl start

3. Navigate to http://localhost and confirm it works:
 

4. Let's do some tweaks for optimized usage of Apache and PHP:
Configure User Level Root:

Add  a "user.conf" file under:

/etc/apache2/users/

where user is your OS X user.

cd /etc/apache2/users

touch user.conf 

5. Add the below content to the newly created file - replace user with your real username:

<Directory "/Users/user/Sites/">
AllowOverride All
Options Indexes MultiViews FollowSymLinks
Require all granted
</Directory>

6. Permissions on the file should be:

7. Edit httpd.conf file

vi /etc/apache2/httpd.conf

8. Make sure following modules are loaded - lines are not commented:

LoadModule authz_core_module libexec/apache2/mod_authz_core.so

LoadModule authz_host_module libexec/apache2/mod_authz_host.so

LoadModule userdir_module libexec/apache2/mod_userdir.so

LoadModule include_module libexec/apache2/mod_include.so

LoadModule rewrite_module libexec/apache2/mod_rewrite.so 

LoadModule php7_module libexec/apache2/libphp7.so

Uncomment also following line:

Include /private/etc/apache2/extra/httpd-userdir.conf 

9. Uncomment following line:

Include /private/etc/apache2/users/*.conf

from the following file: 

/etc/apache2/extra/httpd-userdir.conf

10. Being still root, restart Apache:

apachectl restart

11. User document root is displayed at:

http://localhost/~user/ 

12. Test PHP by adding a file phptest.php under /Users/user/Sites/ folder with the following text:

 <?php phpinfo(); ?>

13. Navigate to this PHP page - Now Apache and PHP works well together