Install Composer on Webfaction

Log in to your Webfaction with SSH

cd $HOME

ln -s `which php72` ~/bin/php
export PATH=$HOME/bin:$PATH
curl -sS https://getcomposer.org/installer | php72
echo -e "\n# Composer\nalias composer=\"php72 \$HOME/bin/composer.phar\"" >> 
$HOME/.bash_profile
source $HOME/.bash_profile

Now you can use composer

Exemple:

composer update