Actually working Linux setup for PHP and MySQL.

lamp-stack.sh

# Update your system and its repositories
sudo apt-get update
sudo apt-get upgrade

# Install Apache Server
sudo apt-get install apache2

# Install MySQL Server
sudo apt-get install mysql-server
mysql_secure_installation
# Validate Password: n
# New Password: 123456
# Re Enter Password: 123456
# Remove anonymous users: y
# Disallow root login remotely: y
# Remove test database and access to it: n
# Reload privileges table: y

# Install PHP
sudo add-apt-repository ppa:ondrej/php
sudo apt-get install php libapache2-mod-php php-mysql

# Setup MySQL root user
sudo mysql
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '12345678';

# Fix directory permissions
chown -R samlovescoding:samlovescoding /var/www
chmod -R 755 /var/www

# Put index.php before index.html if you want Apache2 to load index.php before index.html file.
sudo nano /etc/apache2/mods-enables/dir.conf
sudo service apache2 restart

# Install other PHP modules. Feel free to list your favorite modules. I'll add them if I feel they are common.
sudo apt-get install php-curl php-mbstring php-mcrypt 

This is not a script you can download and run. Run each command one by one!
MySQL username: root
MySQL password: 12345678