Decorator模式在中间件中使用backingnet会话开始
";$下一步();echo"
会话结束
";}}classMysqlimplementsMiddleware{publicfunctionhandle($next){echo"
MysqlStart
";$下一步();echo"
Mysql结束
";}}functionrun($next,$step){returnfunction()use($next,$step){call_user_func_array([new$step,'handle'],[$next]);};}$class=[Session::class,Mysql::class];$callback=array_reduce($class,'App\run',function(){});$回调();运行结果MysqlStartSessionStartSessionEndMysqlend
