Composer对PHP版本错误提示

错误如下：

Composer detected issues in your platform:

Your Composer dependencies require a PHP version ">= 7.4.0". You are running 7.3.24-(to be removed in future macOS).

PHP Fatal error:  Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.4.0". You are running 7.3.24-(to be removed in future macOS). 

解决办法：

1、在项目根目录的composer.josn内增加

{
    "config": {
    
        "platform-check": false
    }
}

2、清除配置缓存：

run php artisan config:cache

3、重构对象，在控制台执行：

composer dump-autoload