1.先安装composer
(the recommended path, not needed.)
cd /usr/local/bin
(install)
sudo curl -s https://getcomposer.org/installer | sudo php
(add execute permissions.)
sudo chmod a+x composer.phar
(this step is not necessary. if needed, you can use this script to update composer.)
sudo composer.phar self-update
mv composer.phar /usr/bin/composer
要有这一步，否则不能直接使用composer命令
进入到www目录
composer create-project laravel/laravel --prefer-dist