PHP框架中的数据库连接是持久的吗
laravel,ci等PHP框架中的数据连接是持久的吗?比如我一配置了数据库配置文件，在任何的文件控制器模型中都能取出数据，那么框架启动时，是不是每个数据库只连接打开一次，而不是每个页面都要重新连接数据库。用PHP框架可以减少这方面的重复数据库连接开销吗。
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laravel,ci等PHP框架中的数据连接是持久的吗?比如我一配置了数据库配置文件，在任何的文件控制器模型中都能取出数据，那么框架启动时，是不是每个数据库只连接打开一次，而不是每个页面都要重新连接数据库。用PHP框架可以减少这方面的重复数据库连接开销吗。
持久连接是由相应的PHP扩展的参数所决定的，PHP框架也只是封装了一层操作而已，一般的框架都会默认使用持久连接，但并不是 用PHP框架就可以减少这方面的重复数据库连接开销 ， 这方面的工作是PHP扩展来完成的，不能归功到PHP框架上，你自己写也能够实现。
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