How to Install Symfony 2.8 under Ubuntu 16.04?

$ sudo curl -LsS -o /usr/local/bin/symfony
$ sudo chmod a+x /usr/local/bin/symfony

This will create a global symfony command in your system.

$ symfony new my_project_name // $ symfony new blog

use the most recent version in any Symfony branch
$ symfony new my_project_name 2.8
$ symfony new my_project_name 3.1

use a specific Symfony version
$ symfony new my_project_name 2.8.1
$ symfony new my_project_name 3.0.2

The installer also supports a special version called lts which installs the most recent Symfony LTS version available:

$ symfony new my_project_name lts


Symfony 2.8.7 was successfully installed but your system doesn’t meet its
technical requirements! Fix the following issues before executing
your Symfony application:

* simplexml_import_dom() must be available
> Install and enable the SimpleXML extension.

After fixing these issues, re-check Symfony requirements executing this command:

php blog/app/check.php

Then, you can:

* Change your current directory to /home/ubunto/blog

* Configure your application in app/config/parameters.yml file.

* Run your application:
1. Execute the php app/console server:run command.
2. Browse to the http://localhost:8000 URL.

Solveing this issue:

sudo apt-get install php-xml

“sudo apt-get install php-xml” worked for my PHP 7 on Ubuntu 16.04 LTS.

or try:

sudo apt-get install php7.0-xml

This reinstalled/re-enabled SimpleXML and everything is working as intended.

Your system is ready to run Symfony projects

Optional recommendations to improve your setup

* intl extension should be available
> Install and enable the intl extension (used for validators).

Note The command console could use a different php.ini file
~~~~ than the one used with your web server. To be on the
safe side, please check the requirements from your web
server using the web/config.php script.

sudo apt-get install php7.0-intl

Running the Symfony Application

$ cd my_project_name/ // cd blog/
$ php app/console server:run

// Quit the server with CONTROL-C.

Then, open your browser and access the http://localhost:8000/ URL to see the Welcome Page of Symfony