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PHP是用于Web开发的功能强大的脚本语言，任何PHP脚本语言都可以在已安装PHP的Linux、Windows、macOS和Unix系统上运行。在本文中，小编将简单介绍下Debian 9 | Debian 10系统安装PHP 8.0的简单过程。
需要注意的是，PHP 8.0的正式发布时间是2020年11月26日，该版本的PHP将具有许多新功能和性能改进，比较值得期待，这意味着可能需要对代码进行一些修改才能使其在PHP 8.0上运行。此外，PHP 8.0附带的一些不错的新功能包括JIT编译器，命名参数，联合类型，属性等新的特色功能。
步骤1：更新系统
在安装PHP8.0之前，需要将Debian 9 | Debian 10系统更新到最新版本，执行命令如下：
sudo apt update
sudo apt -y upgrade由于可能会有内核更新，因此升级之前建议重新启动系统。
sudo reboot步骤2：添加SurýAPT存储库
可以在在DEB.SURY.ORG存储库中找到Debian的PHP 8软件包以及安装所需的依赖项。
sudo apt update
sudo apt install -y lsb-release ca-certificates apt-transport-https software-properties-common将PHP软件包APT存储库添加到您的Debian服务器。
echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/sury-php.list
导入存储库密钥：
wget -qO - https://packages.sury.org/php/apt.gpg | sudo apt-key add -执行软件包索引更新以确认已添加存储库：
$ sudo apt update
Hit:1 http://mirror.hetzner.de/debian/packages buster InRelease
Hit:2 http://security.debian.org buster/updates InRelease
Hit:3 http://mirror.hetzner.de/debian/packages buster-updates InRelease
Hit:4 http://mirror.hetzner.de/debian/packages buster-backports InRelease
Hit:5 http://mirror.hetzner.de/debian/security buster/updates InRelease
Hit:6 http://deb.debian.org/debian buster InRelease
Hit:7 http://deb.debian.org/debian buster-updates InRelease
Hit:8 http://deb.debian.org/debian buster-backports InRelease
Get:9 https://packages.sury.org/php buster InRelease [6,759 B]
Get:10 https://packages.sury.org/php buster/main amd64 Packages [148 kB]
Fetched 155 kB in 2s (83.2 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
7 packages can be upgraded. Run 'apt list --upgradable' to see them.步骤3：安装PHP 8.0版本
添加存储库后就可以开始在Debian 9 | Debian 10系统上安装PHP 8.0，执行以下命令：
sudo apt update
sudo apt install php8.0按 y 键开始安装：
....
Reading state information... Done
The following additional packages will be installed:
apache2-bin libapache2-mod-php8.0 libapr1 libaprutil1 libaprutil1-dbd-sqlite3 libaprutil1-ldap libbrotli1 libgdbm-compat4 libjansson4 liblua5.2-0 libperl5.28
libsodium23 perl php-common php8.0-cli php8.0-common php8.0-opcache php8.0-readline psmisc
Suggested packages:
apache2-doc apache2-suexec-pristine | apache2-suexec-custom www-browser php-pear perl-doc libterm-readline-gnu-perl | libterm-readline-perl-perl make
libb-debug-perl liblocale-codes-perl
Recommended packages:
apache2
The following NEW packages will be installed:
apache2-bin libapache2-mod-php8.0 libapr1 libaprutil1 libaprutil1-dbd-sqlite3 libaprutil1-ldap libbrotli1 libgdbm-compat4 libjansson4 liblua5.2-0 libperl5.28
libsodium23 perl php-common php8.0 php8.0-cli php8.0-common php8.0-opcache php8.0-readline psmisc
0 upgraded, 20 newly installed, 0 to remove and 7 not upgraded.
Need to get 10.4 MB of archives.
After this operation, 55.1 MB of additional disk space will be used.
Do you want to continue? [Y/n] y确认服务器上的默认PHP版本：
$ php -v
PHP 8.0.0RC3 (cli) (built: Nov 3 2020 14:33:19) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.0-dev, Copyright (c) Zend Technologies
with Zend OPcache v8.0.0RC3, Copyright (c), by Zend Technologies步骤4：安装PHP 8.0扩展
在Debian 9 | Debian 10系统安装PHP 8.0扩展，可以使用以下命令语法：
sudo apt install php8.0-<extension>- 注意：<extension>替换为实际的扩展名。
一些可用的扩展名如下所示：
$ sudo apt install php8.0-
php8.0-bcmath php8.0-curl-dbgsym php8.0-gmp-dbgsym php8.0-mysql php8.0-pspell-dbgsym php8.0-tidy
php8.0-bcmath-dbgsym php8.0-dba php8.0-imap php8.0-mysql-dbgsym php8.0-readline php8.0-tidy-dbgsym
php8.0-bz2 php8.0-dba-dbgsym php8.0-imap-dbgsym php8.0-odbc php8.0-readline-dbgsym php8.0-xdebug
php8.0-bz2-dbgsym php8.0-dev php8.0-interbase php8.0-odbc-dbgsym php8.0-snmp php8.0-xml
php8.0-cgi php8.0-enchant php8.0-interbase-dbgsym php8.0-opcache php8.0-snmp-dbgsym php8.0-xml-dbgsym
php8.0-cgi-dbgsym php8.0-enchant-dbgsym php8.0-intl php8.0-opcache-dbgsym php8.0-soap php8.0-xsl
php8.0-cli php8.0-fpm php8.0-intl-dbgsym php8.0-pgsql php8.0-soap-dbgsym php8.0-zip
php8.0-cli-dbgsym php8.0-fpm-dbgsym php8.0-ldap php8.0-pgsql-dbgsym php8.0-sqlite3 php8.0-zip-dbgsym
php8.0-common php8.0-gd php8.0-ldap-dbgsym php8.0-phpdbg php8.0-sqlite3-dbgsym
php8.0-common-dbgsym php8.0-gd-dbgsym php8.0-mbstring php8.0-phpdbg-dbgsym php8.0-sybase
php8.0-curl php8.0-gmp php8.0-mbstring-dbgsym php8.0-pspell php8.0-sybase-dbgsym例如：
sudo apt install php8.0-{mysql,cli,common,imap,ldap,xml,fpm,curl,mbstring,zip}使用y键接受安装提示。
The following additional packages will be installed:
libc-client2007e libonig5 libxslt1.1 libzip4 mlock
Suggested packages:
uw-mailutils php-pear
The following NEW packages will be installed:
libc-client2007e libonig5 libxslt1.1 libzip4 mlock php8.0-curl php8.0-fpm php8.0-imap php8.0-ldap php8.0-mbstring php8.0-mysql php8.0-xml php8.0-zip
0 upgraded, 13 newly installed, 0 to remove and 7 not upgraded.
Need to get 3,308 kB of archives.
After this operation, 10.3 MB of additional disk space will be used.
Do you want to continue? [Y/n] y对存储库中可用的所有其他PHP扩展使用相同的安装格式。如果要检查已加载的PHP模块，请使用以下命令：
$ php -m总结
以上就是在Debian 9 | Debian 10系统安装PHP 8.0的全部过程，仅供参考。目前PHP 8.0即将正式发布，有需要在Debian 9 | Debian 10系统安装PHP 8.0的小伙伴可以参考上述教程进行设置。
