In the PHP programming language, there are several ways to start the Apache server, so I want to note this.

There are several ways to start Apache, which is familiar as a server for PHP and other languages. It seems to vary by distribution and version.
/etc/init.d/apache2 status
systemctl status apache2
apache2ctl status
sudo /etc/init.d/apache2 status
sudo systemctl status apache2
sudo apache2ctl status
The above six are basic ways to execute Apache commands.
For WSL bash on Ubuntu 16.xx, it would be sudo /etc/init.d/apache2 status.
When using, replace status with restart, stop, or start.
Be careful.
To install Apache:
Building a Local Development Environment with Apache and PHP7.0 on Ubuntu 16.04