Yii2中的入口文件环境配置

defined ( ‘YII_DEBUG‘ ) or define ( ‘YII_DEBUG‘, true );
defined ( ‘YII_ENV‘ ) or define ( ‘YII_ENV‘, ‘dev‘ );

defined ( ‘YII_DEBUG‘ ) or define ( ‘YII_DEBUG‘, false );
defined ( ‘YII_ENV‘ ) or define ( ‘YII_ENV‘, ‘PRODUCTION‘ );