安装

sudo apt update
sudo apt install php-fpm
systemctl status php7.4-fpm

server {

    # . . . other code

    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.4-fpm.sock;
    }
}

# 重启
sudo systemctl restart nginx

测试

cd /var/www/html/ 
vim info.php

<?php

phpinfo();

访问

http://your_server_ip/info.php