Composer is used to manage.update,install PHP packages you need in Your PHP Project. if you're a laravel user, you will always be in touch with Composer.
Now how to install it ?
Install Composer
Open your Terminal ( Ctrl+shift+T) :
Type this to install latest :
curl -sS https://getcomposer.org/installer | php
Or if you don't have curl:
php -r "readfile('https://getcomposer.org/installer');" | php
If the above syntax error, you may need to install php
sudo apt-get install php5-cli
Or if you have XAMPP for linux already,
just manualy download here https://getcomposer.org/composer.phar
put it in /usr/local/bin
sudo mv composer.phar /usr/local/bin
Link your php on xampp with this :
sudo ln -s /opt/lampp/bin/php /usr/local/bin/php
You Composer in now installed, to test it installed correctly :
composer
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Composer version 1.0.0-alpha8 2014-01-06 18:39:59