Your requirements could not be resolved to an installable set of packages.安装过程出现这个错误，最后是：
To enable extensions, verify that they are enabled in your .ini files:
- /usr/local/php/etc/php.ini
- /usr/local/php/conf.d/002-zendguardloader.ini
You can also run php --ini inside terminal to see which files are used by PHP in CLI mode.
各位大神可碰到过这个问题，求组怎么解决~~~