了解Symfony2导入链中的优先级

假设您有以下三个symfony2配置文件（极其简化），其中AppKernel作为当前环境加载的文件是第一个，app/config/config_env.yml：

imports:
    - { resource: config2.yml }
    - { resource: config3.yml }
parameters:
    param: one

app/config/config_env.yml：

imports:
    - { resource: config2.yml }
    - { resource: config3.yml }
parameters:
    param: one

app/config/config2.yml：

imports:
    - { resource: config4.yml }
parameters:
    param: two

app/config/config3.yml：

imports:
    - { resource: config5.yml }
parameters:
    param: three

app/config/config4.yml：

parameters:
    param: four

app/config/config5.yml：

parameters:
    param: five

每当我从代码中引用param时，您能否帮助我理解与param（一、二、三、四或五）关联的值是什么，以及为什么？或者，换句话说，关于进口的Symfony2优先规则是什么

谢谢

---

罗德里戈

让我们想想西蒙尼在做什么

首先，它加载config_env.yml

imports:
    - { resource: config2.yml }
    - { resource: config3.yml }
parameters:
    param: one

下一步：加载导入

imports:
    - { resource: config4.yml }
parameters:
    param: two
imports:
    - { resource: config5.yml }
parameters:
    param: three
parameters:
    param: one

下一步：合并它们

imports:
    - { resource: config4.yml }
    - { resource: config5.yml }
parameters:
    param: two
    param: three
    param: one

parameters:
    param: four
    param: five
    param: two
    param: three
    param: one

下一步：加载导入

parameters:
    param: four
parameters:
    param: five
parameters:
    param: two
    param: three
    param: one

下一步：合并它们

imports:
    - { resource: config4.yml }
    - { resource: config5.yml }
parameters:
    param: two
    param: three
    param: one

parameters:
    param: four
    param: five
    param: two
    param: three
    param: one

现在重要的是要知道symfony覆盖了set参数。 那么答案是什么？最后，param是一。试试看