$ curl -sS https://getcomposer.org/installer | php
$ mv composer.phar /usr/local/bin/composer
$ sudo composer config -l -g
$ sudo vim /root/.composer/config.json
{ "config":{} ,"repositories": [ {"type": "composer", "url": "http://pkg.phpcomposer.com/repo/packagist/"},
{"packagist": false} ]}
$ composer self-update
如果不能使用 composer 创建项目 解决方式 :加上
{
"config": {
"secure-http": false
}
}