都CentOS8了，官方源自带的php还是7.2版本，装个php8好了。
先下载解压并进入php8的源码目录：
wget https://www.php.net/distributions/php-8.0.3.tar.gz
tar xzf php-8.0.3.tar.gz
cd php-8.0.3如果提示：
-bash: wget: command not found就是没有安装wget，先安装再执行上面的命令：
yum install wget -y安装工具包和依赖：
yum install epel-release -y
yum groupinstall "Development tools" -y
yum install dnf-plugins-core
yum config-manager --set-enabled powertools
yum install libxml2-devel sqlite-devel oniguruma-devel \
httpd-devel mysql-devel enchant-devel \
libffi-devel libwebp-devel libXpm-devel \
libiodbc-devel libsodium-devel libxslt-devel \
libcurl-devel libpng-devel libjpeg-devel \
freetype-devel libzip-devel \
systemtap-sdt-devel libicu-devel systemd-devel -y编译配置：把能开启的功能都打开：
./configure --with-apxs2=/usr/bin/apxs \
--with-mysqli=/usr/bin/mysql_config \
--with-mysql-sock=/var/lib/mysql/mysql.sock \
--with-openssl \
--with-zlib \
--with-curl \
--with-enchant \
--with-ffi \
--with-webp \
--with-jpeg \
--with-xpm \
--with-freetype \
--with-valgrind \
--with-kerberos \
--with-imap-ssl \
--with-unixODBC \
--with-zip \
--with-pcre-jit \
--with-mhash \
--with-imap-ssl \
--with-iodbc \
--with-sodium \
--with-xsl \
--enable-exif \
--enable-gd \
--enable-gd-jis-conv \
--enable-zts \
--enable-mbstring \
--enable-sigchild \
--enable-dtrace \
--enable-sockets \
--enable-calendar \
--enable-bcmath \
--enable-intl \
--enable-pcntl \
--enable-shmop \
--enable-soap \
--enable-fpm \
--enable-ftp \
--enable-sysvmsg \
--enable-sysvsem \
--enable-sysvshm \
--with-fpm-systemd编译并安装：
make && make install将配置文件复制到php的安装目录：
cp php.ini-production /usr/local/lib/php.ini注意有两个配置文件，一个是开发版一个是可以投入生产的版本。 安装过程中自动安装apache httpd服务器。