环境重装，重新安装一把composer，但是选择php7之后版本报错，本地环境不用php7是绝对不行的…
The PHP exe file you specified did not run correctly:
C:\phpStudy\PHPTutorial\php\php-7.2.1-nts\php.exe
The program failed to run correctly. Try reinstalling the program to fix this problem. Make sure you have installed the appropriate Visual C++ Redistributable.
确定问题，缺少VC14，下载安装之后再安装composer即解决
下载地址：http://www.xdowns.com/soft/184/dll/2016/Soft_164980.html
记得安装完之后重启一下cmd，否则composer命令无法再当前cmd中执行