安装 Composer
参考链接
命令行窗口下执行 php -v 检查是否已经正确安装 PHP, 如果没有安装, 安装它, 再把路径加到环境变量 PATH 中....此时, composer.json 会多了 repositories 字段 (以 laravel 为例):
{
"name": "laravel/laravel",
"description...": "The Laravel Framework...",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require...": {
"php": ">=5.5.9",
"laravel/framework": "5.2.*"
},
"config": {
"preferred-install