php开启了openssl
D:\teshuanzhaun\PHPTutorial\tools\composer>composer -v
______
/ ____/___ ____ ___ ____ ____ ________ _____
/ / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
/_/
Composer version 1.2.1 2016-09-12 11:27:19
查看版本都没问题，但是执行composer install，总是出现下面这些，改怎么处理呢？
D:\teshuanzhaun\PHPTutorial\tools\composer>composer install
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Generating autoload files
