当我尝试安装laravel特使并运行以下命令时：
composer global要求"laravel/特使=~1.0"
我在终端收到了这个答案：
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Conclusion: don't install laravel/envoy v1.1.0
- Conclusion: don't install laravel/envoy v1.0.27
- Conclusion: don't install laravel/envoy v1.0.26
- Conclusion: don't install laravel/envoy v1.0.25
- Conclusion: don't install laravel/envoy v1.0.24
- Conclusion: don't install laravel/envoy v1.0.23
- Conclusion: don't install laravel/envoy v1.0.22
- Conclusion: don't install laravel/envoy v1.0.21
- Conclusion: don't install laravel/envoy v1.0.20
- Conclusion: don't install laravel/envoy v1.0.19
- Conclusion: don't install laravel/envoy v1.0.18
- Conclusion: don't install laravel/envoy v1.0.17
- Conclusion: don't install laravel/envoy v1.0.16
- Conclusion: don't install laravel/envoy v1.0.15
- Conclusion: don't install laravel/envoy v1.0.14
- Conclusion: don't install laravel/envoy v1.0.13
- Conclusion: don't install laravel/envoy v1.0.12
- Conclusion: don't install laravel/envoy v1.0.11
- Conclusion: don't install laravel/envoy 1.0.5
- Conclusion: don't install laravel/envoy 1.0.3
- Conclusion: don't install laravel/envoy 1.0.2
- Conclusion: remove symfony/process v3.0.4
- Installation request for laravel/envoy ~1.0 -> satisfiable by laravel/envoy[1.0.0, 1.0.2, 1.0.3, 1.0.5, v1.0.11, v1.0.12, v1.0.13, v1.0.14, v1.0.15, v1.0.16, v1.0.17, v1.0.18, v1.0.19, v1.0.20, v1.0.21, v1.0.22, v1.0.23, v1.0.24, v1.0.25, v1.0.26, v1.0.27, v1.1.0].
- Conclusion: don't install symfony/process v3.0.4
- laravel/envoy 1.0.0 requires symfony/process 2.4.* -> satisfiable by symfony/process[v2.4.0, v2.4.1, v2.4.10, v2.4.2, v2.4.3, v2.4.4, v2.4.5, v2.4.6, v2.4.7, v2.4.8, v2.4.9].
- Can only install one of: symfony/process[v2.4.0, v3.0.4].
- Can only install one of: symfony/process[v2.4.1, v3.0.4].
- Can only install one of: symfony/process[v2.4.10, v3.0.4].
- Can only install one of: symfony/process[v2.4.2, v3.0.4].
- Can only install one of: symfony/process[v2.4.3, v3.0.4].
- Can only install one of: symfony/process[v2.4.4, v3.0.4].
- Can only install one of: symfony/process[v2.4.5, v3.0.4].
- Can only install one of: symfony/process[v2.4.6, v3.0.4].
- Can only install one of: symfony/process[v2.4.7, v3.0.4].
- Can only install one of: symfony/process[v2.4.8, v3.0.4].
- Can only install one of: symfony/process[v2.4.9, v3.0.4].
- Installation request for symfony/process == 3.0.4.0 -> satisfiable by symfony/process[v3.0.4].
~/.composer:中的我的composer.json文件
{
"require": {
"laravel/installer": "^1.3"
}
}
我正在使用Laravel 5.2。
我找到了这个问题的解决方案。
这个问题的存在是因为Laravel 5.2需要symfony/process 2.8.*|3.0.*，Envoy需要symfony/process 2.4.*，并且当您使用更高的symfony-process版本时，为了实现版本的差异，它会遇到一些麻烦。
解决方案：
在~/.composer:中打开composer.json文件
$ vi ~/.composer/composer.json
它应该是这样的：
{
"require": {
"laravel/installer": "^1.3"
}
}
更改为：
{
"require": {
"laravel/envoy": "~1.0",
"laravel/installer": "^1.3"
}
}
现在使用：
$ composer global require "laravel/envoy=~1.0"
别忘了从$PATH 中提供作曲家别名
composer global require laravel/envoy
您可能需要（如果还没有）将全局composer目录添加到$PATH中
将此行添加到您的~/.bash_profile或~/.bashrc中。
export PATH="$HOME/.composer/vendor/bin:$PATH"