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PHP7.4 升级hyperf2.2启动报错

### 问题描述
```bash
[root@localhost hall-activity]# php -d swoole.use_shortname=Off bin/hyperf.php start
PHP Fatal error:  Uncaught Error: Call to undefined function Hyperf\Di\Annotation\pcntl_fork() in /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/Annotation/Scanner.php:120
Stack trace:
#0 /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/ClassLoader.php(52): Hyperf\Di\Annotation\Scanner->scan()
#1 /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/ClassLoader.php(87): Hyperf\Di\ClassLoader->__construct()
#2 /mnt/hgfs/VMShare/web/hall-activity/bin/hyperf.php(18): Hyperf\Di\ClassLoader::init()
#3 /mnt/hgfs/VMShare/web/hall-activity/bin/hyperf.php(24): {closure}()
#4 {main}
  thrown in /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/Annotation/Scanner.php on line 120

Fatal error: Uncaught Error: Call to undefined function Hyperf\Di\Annotation\pcntl_fork() in /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/Annotation/Scanner.php:120
Stack trace:
#0 /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/ClassLoader.php(52): Hyperf\Di\Annotation\Scanner->scan()
#1 /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/ClassLoader.php(87): Hyperf\Di\ClassLoader->__construct()
#2 /mnt/hgfs/VMShare/web/hall-activity/bin/hyperf.php(18): Hyperf\Di\ClassLoader::init()
#3 /mnt/hgfs/VMShare/web/hall-activity/bin/hyperf.php(24): {closure}()
#4 {main}
  thrown in /mnt/hgfs/VMShare/web/hall-activity/vendor/hyperf/di/src/Annotation/Scanner.php on line 120
```

### Swoole版本，PHP版本，以及操作系统版本信息
![](/storage/article-column/EeJTZvU29XVkoQV72TOj29cJthbvrvrk5ysd4cGB.png)
![](/storage/article-column/YmynbHhZEyqgrbbxNcoSwzoZe6v2VZRKsITpcKbQ.png)

```bash
[root@localhost hall-activity]# php -m
[PHP Modules]
bcmath
bz2
calendar
Core
ctype
curl
date
dba
dom
exif
fileinfo
filter
ftp
gettext
gmp
hash
iconv
intl
json
libxml
mbstring
mysqli
mysqlnd
openssl
pcre
PDO
pdo_mysql
pdo_sqlite
Phar
posix
readline
redis
Reflection
session
shmop
SimpleXML
soap
sockets
SPL
sqlite3
standard
swoole
sysvmsg
sysvsem
sysvshm
tokenizer
xml
xmlreader
xmlrpc
xmlwriter
xsl
zip
zlib

[Zend Modules]

composer信息
```php
{
    "name": "hyperf/hyperf-skeleton",
    "type": "project",
    "keywords": [
        "php",
        "swoole",
        "framework",
        "hyperf",
        "microservice",
        "middleware"
    ],
    "description": "A coroutine framework that focuses on hyperspeed and flexible, specifically use for build microservices and middlewares.",
    "license": "Apache-2.0",
    "require": {
        "php": ">=7.3",
        "ext-json": "*",
        "96qbhy/hyperf-auth": "^2.3",
        "firebase/php-jwt": "^5.3",
        "hyperf/async-queue": "^2.2",
        "hyperf/cache": "^2.2",
        "hyperf/command": "~2.2.0",
        "hyperf/config": "~2.2.0",
        "hyperf/constants": "^2.2",
        "hyperf/crontab": "^2.2",
        "hyperf/database": "~2.2.0",
        "hyperf/db-connection": "~2.2.0",
        "hyperf/filesystem": "^2.2",
        "hyperf/framework": "~2.2.0",
        "hyperf/guzzle": "^2.2",
        "hyperf/http-server": "~2.2.0",
        "hyperf/logger": "~2.2.0",
        "hyperf/memory": "~2.2.0",
        "hyperf/process": "~2.2.0",
        "hyperf/redis": "^2.2",
        "hyperf/socketio-server": "^2.2",
        "hyperf/validation": "^2.2",
        "hyperf/websocket-server": "^2.2",
        "overtrue/flysystem-qiniu": "^1.0"
    },
    "require-dev": {
        "friendsofphp/php-cs-fixer": "^2.14",
        "hyperf/devtool": "~2.2.0",
        "hyperf/testing": "~2.2.0",
        "mockery/mockery": "^1.0",
        "phpstan/phpstan": "^0.12",
        "swoole/ide-helper": "^4.5"
    },
    "suggest": {
        "ext-openssl": "Required to use HTTPS.",
        "ext-pdo": "Required to use MySQL Client.",
        "ext-pdo_mysql": "Required to use MySQL Client.",
        "ext-redis": "Required to use Redis Client."
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/"
        },
        "files": [
            "app/Common/Helper/Helper.php"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "HyperfTest\\": "./test/"
        }
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "config": {
        "optimize-autoloader": true,
        "sort-packages": true
    },
    "extra": [],
    "scripts": {
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-autoload-dump": [
            "rm -rf runtime/container"
        ],
        "test": "co-phpunit -c phpunit.xml --prepend test/bootstrap.php --colors=always",
        "cs-fix": "php-cs-fixer fix $1",
        "analyse": "phpstan analyse --memory-limit 300M -l 0 -c phpstan.neon ./app ./config",
        "start": [
            "Composer\\Config::disableProcessTimeout",
            "php ./bin/hyperf.php start"
        ]
    }
}

```
```
### 相关代码
```php
请将代码粘贴至此处（请勿用截图）
```

### 你期待的结果是什么？实际看到的错误信息又是什么？
已经删除composer.lock,vender文件夹 重新安装
我是在虚拟机跑的，系统：CentOS Linux release 7.9.2009 (Core)

发布于2年前 · 37 次浏览 · 来自提问