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执行composer require hyperf/view-engine命令报错，报错内容如下：

Your requirements could not be resolved to an installable set of packages.

Problem 1

- Root composer.json requires hyperf/view-engine ^3.0 -> satisfiable by hyperf/view-engine[v3.0.0-alpha.1, ..., 3.0.x-dev].

- hyperf/view-engine[v3.0.0-alpha.1, ..., 3.0.x-dev] require hyperf/config 3.0.0 -> found hyperf/config[dev-master, v3.0.0-alpha.1, ..., 3.0.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (2.2.0).

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

You can also try re-running composer require with an explicit version constraint, e.g. "composer require hyperf/view-engine:*" to figure out if any version is installable, or "composer require hyperf/view-engine:^2.1" if you know which you need.

Installation failed, reverting ./composer.json and ./composer.lock to their original content.

解决方法：

• 方法一：安装视图引擎需要用到的依赖包hyperf/config 3.0.0(需要注意的是这个安装包要求PHP版本>=8.0，因为示例安装的PHP是7.4.26所以会报错)

  • 执行命令composer require hyperf/config ~3.0.0

    • 如果PHP版本低于8.0则会报如下错误：（解决方案：一 升级PHP，二 降低hyperf/view-engine的版本）

      bash-5.0# composer require hyperf/config ~3.0.0
      ./composer.json has been updated
      Running composer update hyperf/config
      Loading composer repositories with package information
      Updating dependencies
      Your requirements could not be resolved to an installable set of packages.
      
        Problem 1
          - hyperf/config[v3.0.0-alpha.1, ..., 3.0.x-dev] require php >=8.0 -> your php version (7.4.26) does not satisfy that requirement.
          - Root composer.json requires hyperf/config ~3.0.0 -> satisfiable by hyperf/config[v3.0.0-alpha.1, ..., 3.0.x-dev].
      
      Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.
      
      Installation failed, reverting ./composer.json and ./composer.lock to their original content.

  • 然后重新安装composer require hyperf/view-engine

• 方法二：降低安装的视图引擎版本

  • 执行命令composer require hyperf/view-engine:^2.2

  • 2.2版本号与项目根目录的composer.json文件内require下hyperf/组件的版本号(如下)

        "require": {
            "php": ">=7.3",
            "hyperf/cache": "~2.2.0",
            "hyperf/command": "~2.2.0",
            "hyperf/config": "~2.2.0",
            "hyperf/db-connection": "~2.2.0",
            "hyperf/framework": "~2.2.0",
            "hyperf/guzzle": "~2.2.0",
            "hyperf/http-server": "~2.2.0",
            "hyperf/logger": "~2.2.0",
            "hyperf/memory": "~2.2.0",
            "hyperf/process": "~2.2.0",
            "hyperf/task": "^2.2",
            "hyperf/view": "^2.2"
        }

  • 命令执行结果如下，安装成功