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PHP是一种流行的Web开发脚本语言，最初由丹麦裔加拿大程序员Rasmus Lerdorf在1994年创建。他所创建的PHP脚本可以在Linux、macOS、Windows和许多其他Unix系统上执行，前提是已安装PHP环境。
在本文中，小编将简单说明在Ubuntu 20.04 | Ubuntu 18.04 Linux系统上安装PHP 8.0版本的简单过程，有需要安装PHP8.0版本的小伙伴不妨关注下。
PHP 8.0正式版本已经在2020年11月26日发布，它是一个新的主要版本，具有许多新功能和性能改进，这意味着你可能需要对代码进行一些修改才能使其在PHP 8.0上运行。PHP 8.0附带的一些不错的新功能包括JIT编译器、参数、联合类型、属性等等。
步骤1：系统更新
通过运行以下命令，将所有系统软件包更新为最新版本。
sudo apt update
sudo apt -y upgrade升级后重新启动很重要，命令如下：
sudo systemctl reboot步骤2：添加OndrejSuryPPA存储库
最新的PHP软件包可在OndrejSuryPPA存储库中获得，运行下面共享的命令，以将此存储库添加到您的Ubuntu系统。
sudo apt update
sudo apt install lsb-release ca-certificates apt-transport-https software-properties-common -y
sudo add-apt-repository ppa:ondrej/php当提示您添加存储库时，按Enter键：
Debian oldstable and stable packages are provided as well: https://deb.sury.org/#debian-dpa
You can get more information about the packages at https://deb.sury.org
IMPORTANT: The <foo>-backports is now required on older Ubuntu releases.
BUGS&FEATURES: This PPA now has a issue tracker:
https://deb.sury.org/#bug-reporting
CAVEATS:
1. 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
PLEASE READ: If you like my work and want to give me a little motivation, please consider donating regularly: https://donate.sury.org/
WARNING: add-apt-repository is broken with non-UTF-8 locales, see
https://github.com/oerdnj/deb.sury.org/issues/56 for workaround:
# LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php
More info: https://launchpad.net/~ondrej/+archive/ubuntu/php
Press [ENTER] to continue or Ctrl-c to cancel adding it.从更新输出中，你应该能看到添加的存储库：
Hit:1 http://mirror.hetzner.de/ubuntu/packages focal InRelease
Hit:2 http://mirror.hetzner.de/ubuntu/packages focal-updates InRelease
Hit:3 http://mirror.hetzner.de/ubuntu/packages focal-backports InRelease
Hit:4 http://mirror.hetzner.de/ubuntu/packages focal-security InRelease
Get:5 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease [23.9 kB]
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:8 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:9 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Get:10 http://ppa.launchpad.net/ondrej/php/ubuntu focal/main amd64 Packages [74.8 kB]
Get:11 http://ppa.launchpad.net/ondrej/php/ubuntu focal/main i386 Packages [20.2 kB]
Get:12 http://ppa.launchpad.net/ondrej/php/ubuntu focal/main Translation-en [28.2 kB]
Fetched 147 kB in 1s (158 kB/s)
Reading package lists... Done步骤3：在Ubuntu 20.04 | 18.04上安装PHP 8.0
更新APT索引只是为了确保可以安装软件包：
sudo apt update然后在Ubuntu 20.04 | 18.04 Linux系统上安装PHP 8.0：
sudo apt install php8.0按y键开始安装：
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
apache2-bin libapache2-mod-php8.0 libapr1 libaprutil1 libaprutil1-dbd-sqlite3 libaprutil1-ldap libgdbm-compat4 libjansson4 liblua5.2-0 libmagic-mgc libmagic1
libperl5.30 perl perl-modules-5.30 php-common php8.0-cli php8.0-common php8.0-opcache php8.0-readline
Suggested packages:
apache2-doc apache2-suexec-pristine | apache2-suexec-custom www-browser php-pear file 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 libgdbm-compat4 libjansson4 liblua5.2-0 libmagic-mgc libmagic1
libperl5.30 perl perl-modules-5.30 php-common php8.0 php8.0-cli php8.0-common php8.0-opcache php8.0-readline
0 upgraded, 20 newly installed, 0 to remove and 7 not upgraded.
Need to get 13.0 MB of archives.
After this operation, 78.4 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: Oct 31 2020 17:06:41) ( 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：在Ubuntu 20.04 | 18.04上安装PHP 8.0扩展
要在Ubuntu 20.04 | 18.04上安装PHP 8扩展，请使用以下命令语法：
sudo apt install php8.0-<extension>一些可用的扩展名如下所示：
$ sudo apt install php8.0-
php8.0-amqp php8.0-common php8.0-gd php8.0-ldap php8.0-odbc php8.0-readline php8.0-sqlite3 php8.0-xsl
php8.0-apcu php8.0-curl php8.0-gmp php8.0-mailparse php8.0-opcache php8.0-redis php8.0-sybase php8.0-yac
php8.0-ast php8.0-dba php8.0-igbinary php8.0-mbstring php8.0-pgsql php8.0-rrd php8.0-tidy php8.0-yaml
php8.0-bcmath php8.0-dev php8.0-imagick php8.0-memcached php8.0-phpdbg php8.0-smbclient php8.0-uuid php8.0-zip
php8.0-bz2 php8.0-ds php8.0-imap php8.0-msgpack php8.0-pspell php8.0-snmp php8.0-xdebug php8.0-zmq
php8.0-cgi php8.0-enchant php8.0-interbase php8.0-mysql php8.0-psr php8.0-soap php8.0-xhprof
php8.0-cli php8.0-fpm php8.0-intl php8.0-oauth php8.0-raphf php8.0-solr php8.0-xml例如：
sudo apt install php8.0-cli php8.0-common php8.0-imap php8.0-redis php8.0-snmp php8.0-xml你也可以使用相同的格式来安装其他扩展。
结论
以上就是在Ubuntu 20.04 | 18.04系统中安装PHP 8.0的大致过程，安装方法比较简单，比较重要的就是在安装之前需要更新APT索引。如果不清楚在Ubuntu 20.04 | 18.04系统中安装PHP 8.0的过程，可以参考上述教程进行安装。
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