Installaton of Php-cs-fixer.

sudo apt-get install php-pear

pear install php_CodeSniffer

wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.0.0/php-cs-fixer.phar -O php-cs-fixer

chmod +x php-cs-fixer

mv php-cs-fixer /usr/local/bin/php-cs-fixer

chown -R user name: /usr/local/bin/php-cs-fixer

Run the command

php-cs-fixer