Debian升級PHP步驟如下：
/etc/php/下的相關配置）。sudo apt update
sudo apt install --only-upgrade php*
sudo apt install apt-transport-https lsb-release ca-certificates
curl -sSLo /usr/share/keyrings/deb.sury.org-php.gpg https://packages.sury.org/php/apt.gpg
echo "deb [signed-by=/usr/share/keyrings/deb.sury.org-php.gpg] https://packages.sury.org/php/$(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php.list
sudo apt update
sudo apt install php8.3 php8.3-cli php8.3-fpm php8.3-{bz2,curl,mbstring,intl}
sudo apt purge php8.2* # 替換為需移除的舊版本號
sudo systemctl restart apache2sudo systemctl restart nginxsudo systemctl restart php8.3-fpmphp -v
注意：
update-alternatives工具。
