How to install Composer on Debian

To make Composer (globally) available on Debian:

cd /usr/src
sudo apt-get install curl php5-cli
curl -sS https://getcomposer.org/installer | sudo php -- --install-dir=/usr/local/bin --filename=composer

Verify installation:

composer --version
Composer version 4ecdbf89c4a3d1e5dfe73c57e3202a5e2a18c87e 2014-07-28 20:12:27

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