Example
Global installation using the PHP Archive
wget https://phar.phpunit.de/phpunit.phar # download the archive file
chmod +x phpunit.phar # make it executable
sudo mv phpunit.phar /usr/local/bin/phpunit # move it to /usr/local/bin
phpunit --version # show installed version number
Global installation using Composer
# If you have composer installed system wide
composer global require phpunit/phpunit # set PHPUnit as a global dependency
phpunit --version # show installed version number
# If you have the .phar file of composer
php composer.phar global require phpunit/phpunit # set PHPUnit as a global dependency
phpunit --version # show installed version number
Local installation using Composer
# If you have composer installed system wide
composer require phpunit/phpunit # set PHPUnit as a local dependency
./vendor/bin/phpunit --version # show installed version number
# If you have the .phar file of composer
php composer.phar require phpunit/phpunit # set PHPUnit as a local dependency
./vendor/bin/phpunit --version # show installed version number