php composer Mac 全局 中国镜像

$ 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    }}