按以下步骤走
sudo apt install apt-transport-https ca-certificates curl software-properties-common
sudo curl -fsSL https://packages.sury.org/php/apt.gpg | sudo apt-key add -
sudo add-apt-repository "deb https://packages.sury.org/php/ $(lsb_release -cs) main"
sudo apt update
sudo apt install php7.3 php7.3-fpm php7.3-common php7.3-cli php7.3-zip php7.3-xml php7.3-gd php7.3-mysql php7.3-mbstring php7.3-bcmath
