在Debian上升級PHP到最新版本，可參考以下步驟：
sudo apt install apt-transport-https lsb-release ca-certificates wget -y，sudo wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg，sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/deb.sury.org-php.gpg] https://packages.sury.org/php/$(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'，sudo apt update。sudo apt install php8.4 php8.4-cli php8.4-fpm php8.4-mysql php8.4-xml php8.4-curl php8.4-mbstring php8.4-json php8.4-zip。若需FPM或Apache模塊，安裝對應包。sudo apt purge php舊版本號*，避免沖突。sudo systemctl restart apache2；若用Nginx和PHP - FPM，執行sudo systemctl restart nginx和sudo systemctl restart php8.4 - fpm。php -v命令查看PHP版本，確認升級成功。
