起因：因为历史原因，在本项目中composer.json基本算废了，没法直接使用composer管理扩展，今天尝试修复一下composer.json。

历史文件，可以看出来已经很久没有维护了，我们主要是恢复require的信息

{
    "name": "yiisoft/yii2-app-advanced",
    "description": "Yii 2 Advanced Project Template",
    "keywords": ["yii2", "framework", "advanced", "project template"],
    "homepage": "http://www.yiiframework.com/",
    "type": "project",
    "license": "BSD-3-Clause",
    "support": {
        "issues": "https://github.com/yiisoft/yii2/issues?state=open",
        "forum": "http://www.yiiframework.com/forum/",
        "wiki": "http://www.yiiframework.com/wiki/",
        "irc": "irc://irc.freenode.net/yii",
        "source": "https://github.com/yiisoft/yii2"
    },
    "minimum-stability": "stable",
    "require": {
        "php": ">=5.4.0",
        "yiisoft/yii2": ">=2.0.27",
        "yiisoft/yii2-bootstrap": "*",
        "yiisoft/yii2-swiftmailer": "*",
        "linslin/yii2-curl": "*",
        "firebase/php-jwt": "^5.0",
        "yiisoft/yii2-elasticsearch": "^2.0",
        "yiisoft/yii2-redis": "^2.0",
        "workerman/workerman": "^4.0",
        "workerman/gateway-worker": "^3.0.0"
    },
    "require-dev": {
        "yiisoft/yii2-debug": "*",
        "yiisoft/yii2-gii": "*",
        "yiisoft/yii2-faker": "*"
    },
    "config": {
        "process-timeout": 1800
    },
    "extra": {

        "asset-installer-paths": {
            "npm-asset-library": "vendor/npm",
            "bower-asset-library": "vendor/bower"
        }
    },
    "repositories": {
        "packagist": {
            "type": "composer",
            "url": "https://php.cnpkg.org"
        }
    }
}

第一步：写一个脚本通过composer show --installed 获取已存在的扩展包信息

<?php

/**
 * 通过文件恢复composer.json
 */
declare (strict_types=1);

$content = `composer show --installed`;

preg_match_all('#([A-z0-9\/\-\.]+)\s+([A-z0-9\.\-]+)[\S\s]+?\n#', $content, $matches);

$packages = [
    'php' => '^7.4',
];

foreach ($matches[1] as $key => $name) {
    $packages[$name] = $matches[2][$key];
}

$packages = json_encode($packages);

#下面的内容需要可以从老的composer.json中获取，如果没有可以自己定义
$data = <<<JSON
{
  "name": "yiisoft/yii2-app-advanced",
    "description": "Yii 2 Advanced Project Template",
    "keywords": ["yii2", "framework", "advanced", "project template"],
    "homepage": "http://www.yiiframework.com/",
    "type": "project",
    "license": "BSD-3-Clause",
    "support": {
        "issues": "https://github.com/yiisoft/yii2/issues?state=open",
        "forum": "http://www.yiiframework.com/forum/",
        "wiki": "http://www.yiiframework.com/wiki/",
        "irc": "irc://irc.freenode.net/yii",
        "source": "https://github.com/yiisoft/yii2"
    },
    "minimum-stability": "stable",
      "require": {$packages},
     "extra": {
        "asset-installer-paths": {
            "npm-asset-library": "vendor/npm",
            "bower-asset-library": "vendor/bower"
        }
    }
}
JSON;

$data = json_encode(json_decode($data), JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);

file_put_contents('./composer.json', stripslashes($data));

第二步：通过运行上面的脚本我们可以得到一个包含大部分扩展包的信息，网上大部分文档也都截止于此，这个命令主要是通过 /vendor/composer/installed.json 文件生成的，所以如果文件内本身有缺失就得人为处理

 我操作方案虽然简单但很实用，首先备份一下原来的vendor,然后通过生成好的composer.json 运行安装新文件,使用文件对比工具对比两个vendor的文件差异找出缺失的安装包，手动添加在composer.json文件中

#迁移文件备份
mv vendor ../vendor

#安装扩展
composer require

第三步：勾选对比规则，这样就能一目了然的看到两个包的差异了。比较复杂的是找到这个扩展包对应的版本号，如果实在找不到可以先用*代替，以下是几个找版本号的方法

第四步：手动添加完成后，我们再重新对比文件根据经验查看是否新生成的正常可用

 当然了同样的版本号更新安装的扩展包也并不一定完全相同，就像下面这种，所以需要自己去验证，不影响正常使用那就代表我们这次还原成功。