在mac上通过brew 安装php的memcache扩展（brew install php56-memcache）后运行
~ php -m
PHP Warning: PHP Startup: memcache: Unable to initialize module
Module compiled with build ID=API20131226,NTS
PHP compiled with build ID=API20131226,NTS,debug
These options need to match
in Unknown on line 0
Warning: PHP Startup: memcache: Unable to initialize module
Module compiled with build ID=API20131226,NTS
PHP compiled with build ID=API20131226,NTS,debug
These options need to match
in Unknown on line 0
报了这样的警告信息
解决：
brew remove php56-memcache
brew install php56-memcahe --build-from-source