PHP
version7.4を入れる。
$ sudo add-apt-repository ppa:ondrej/php
以下、message.
If you are using php-gearman, you need to add ppa:ondrej/pkg-gearman
2 . If you are using apache2, you are advised to add ppa:ondrej/apache2
3 If you are using nginx, you are advised to add ppa:ondrej/nginx-mainline or ppa:ondrej/nginx
とりあえず、nginx向けのものだけ、repositoryにいれておいた。local machine. で、
$ sudo apt install php7.4
$ php -v