我的错误，为了解决此问题，我必须删除所有旧的有冲突的扩展，例如因此：

My mistake, in order to fix this, I had to remove all the old conflicting extensions like so:

brew卸载php55-mcrypt php55-xdebug php55-intl php55-igbinary

brew uninstall php55-mcrypt php55-xdebug php55-intl php55-igbinary

，然后使用以下方法重新安装它们并从源代码构建：

and then reinstall them and build from source using:

brew重新安装php56-xdebug php56-intl php56-igbinary php56-mcrypt
--build-from-source

brew reinstall php56-xdebug php56-intl php56-igbinary php56-mcrypt --build-from-source