修复办法：
1) in /Applications/MAMP/bin/php/php5.5.3/conf/php.ini2) set opcache.revalidate_freq=0
3) restart MAMP
http://stackoverflow.com/questions/19073270/stop-caching-for-php-5-5-3-in-mamp
yii,mamp装好后，代码修改不能即时生效
2) set opcache.revalidate_freq=0
修复办法：
1) in /Applications/MAMP/bin/php/php5.5.3/conf/php.ini3) restart MAMP
http://stackoverflow.com/questions/19073270/stop-caching-for-php-5-5-3-in-mamp