Let me explain: PHP variables are typically dynamically scoped, which means the variables are placed on a stack.

让我来解释一下：php变量通常是动态确定范围的，这意味着变量放置在堆栈中。

youdao

Timeout values should ideally be scoped to the service that is being invoked, which means that the intermediary applies a timeout value dynamically at run time.

超时值应根据所调用的服务调整，也就是说中间媒介会在运行时动态应用超时值。

youdao