ubuntu14.04安装composer

cd ~
curl -sS https://getcomposer.org/installer | php

上面命令会安装composer

composer
全局使用：
sudo mv composer.phar /usr/local/bin/composer

使用中国镜像
composer config -g repo.packagist composer https://packagist.phpcomposer.com

然后在/var/www（网站根目录）目录下直接执行
sudo composer create-project laravel/laravel laravel