判断centos环境是否支持workerman的办法

第一步：我用的是宝塔环境，所以出现下面红色的提醒

　　　　【图1】

第二步：将找到php.ini配置文件，宝塔环境直接在后台找即可，把环境中禁用的pcntl_signal_dispatch删除并保存。

　　　　【图2】

结论：重启服务器再次输入图1中的校验，出现图2提示说明正常使用workerman环境了。

安装： fileinfo扩展。

删除：禁用函数：pcntl_alar、pcntl_wait

如下图的提示，安装fileinfo扩展。

./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
    - topthink/think-worker v3.0.4 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
    - topthink/think-worker v3.0.3 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
    - topthink/think-worker v3.0.2 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
    - topthink/think-worker v3.0.1 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
    - topthink/think-worker v3.0.0 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
    - Installation request for topthink/think-worker ^3.0 -> satisfiable by topthink/think-worker[v3.0.0, v3.0.1, v3.0.2, v3.0.3, v3.0.4].

  To enable extensions, verify that they are enabled in your .ini files:
    - /www/server/php/73/etc/php.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

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