安装 Composer

Composer 需要 PHP 5.3.2+ 才能运行。

sudo curl -sS https://getcomposer.org/installer | php -- --install-dir=/home
sudo ln -s /home/composer.phar /usr/local/bin/composer

2.x降级为1.x

composer self-update --1

其他安装方法：https://pkg.phpcomposer.com/#how-to-install-composer

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