laravel安装barryvdh/laravel-debugbar ^3.1报错

Question

E:edu>composer require barryvdh/laravel-debugbar
Using version ^3.1 for barryvdh/laravel-debugbar
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1

- Installation request for barryvdh/laravel-debugbar ^3.1 -> satisfiable by barryvdh/laravel-debugbar[v3.1.0].
- Conclusion: remove laravel/framework v5.4.36
- Conclusion: don't install laravel/framework v5.4.36
- barryvdh/laravel-debugbar v3.1.0 requires illuminate/session 5.5.x -> satisfiable by illuminate/session[v5.5.0, v5.5.16, v5.5.17, v5.5.2].
- don't install illuminate/session v5.5.0|don't install laravel/framework v5.4.36
- don't install illuminate/session v5.5.16|don't install laravel/framework v5.4.36
- don't install illuminate/session v5.5.17|don't install laravel/framework v5.4.36
- don't install illuminate/session v5.5.2|don't install laravel/framework v5.4.36
- Installation request for laravel/framework (locked at v5.4.36, required as 5.4.*) -> satisfiable by laravel/framework[v5.4.36].

Installation failed, reverting ./composer.json to its original content.

Answer 1

你的Laravel框架是5.4的？如果是请改用debugar的分支2.4
https://github.com/barryvdh/l...

Answer 2

stackoverflow上的一个类似问题
意思是你依赖的库还不支持你本地Laravel的版本。
barryvdh/laravel-debugbar在Github上也说了

For Laravel < 5.5, please use the 2.4 branch!

Answer 3

使用laravel5.4的时候，安装完2.4.3版本的之后，我如果再安装其他的包，就会报错误，说需要2.4.0版本的，
报错如下：

Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1

- The requested package barryvdh/laravel-debugbar (installed at v2.4.3, required as 2.4) is satisfiable by barryvdh/laravel-debugbar[v2.4.3] but these conflict with your requirements or minimum-stability.

后来又remove掉2.4.3，重新安装2.4.0，问题解决，所以使用2.4.0的比较好一些composer require barryvdh/laravel-debugbar:2.4.0