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list all of the available PHP 7.0-related packages for review:

$ apt-cache pkgnames | grep php7.0

Install PHP 7 and related packages in Ubuntu:

$ sudo apt-get install -y php7.0 libapache2-mod-php7.0 php7.0-cli php7.0-common php7.0-mbstring php7.0-gd php7.0-intl php7.0-xml php7.0-mysql php7.0-mcrypt php7.0-zip

Switch between PHP versions for apache web server:

    $ sudo a2dismod php7.0
    $ sudo a2enmod php5.6
    $ sudo systemctl restart apache2
    $ sudo service apache2 restart

After switching from one version to another, you can find your PHP configuration file, by running the command below.

    $ which php
    $ which php5.6
    $ which php7.3
    $ sudo update-alternatives --set php /usr/bin/php5.6
    $ php -i | grep "Loaded Configuration File"

To create a phpinfo file, open a plain text file, add the following lines, and save as "phpinfo.php":

<?php

// Show all information, defaults to INFO_ALL
phpinfo();

?>

PHP built in webserver:

    $ php -S localhost:8000

To serve public folder of a framework/webapp:

    $ php -S 0.0.0.0:8080 -t public