mthabsheer

--------------PHP versions----------------
sudo apt show php
OR
sudo apt show php -a
//install default PHP version
sudo apt install php 
First start by adding Ondřej Surý PPA to install different versions of PHP – PHP 5.6, PHP 7.0 and PHP 7.1 on Ubuntu system.
sudo apt install python-software-properties
sudo add-apt-repository ppa:ondrej/php

mthabsheer

dpkg-reconfigure tzdata

mthabsheer

Step 1: create a file named "myservice.service" in /etc/systemd/system 

Step 2: Copy the below code to the file. Replace the path/to/my/script with yours.
[Unit]
Description=My Service
After=network.target
# Mention the required service after which our myservice needs to start
After=mysql.service
Requires=mysql.service