参考：https://www.mf8.biz/centos-rhel-install-php7-3/
1、首先安装 EPEL 源：
yum install epel-release
安装 REMI 源：
yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm
2、安装 Yum 源管理工具：
yum install yum-utils
3、安装 PHP7.3：
yum install -y php73-php-fpm php73-php-cli php73-php-bcmath php73-php-gd php73-php-json php73-php-mbstring php73-php-mcrypt php73-php-mysqlnd php73-php-opcache php73-php-pdo php73-php-pecl-crypto php73-php-pecl-mcrypt php73-php-pecl-geoip php73-php-recode php73-php-snmp php73-php-soap php73-php-xml
安装完成后最好重启一下计算机，不然有可能无法启动php
设置开机启动、运行服务：
systemctl enable php73-php-fpm
systemctl start php73-php-fpm
设置 PHP
查找安装包：
[root@xxx etc]# rpm -qa | grep 'php'
php73-php-cli-7.3.6-1.el7.remi.x86_64
php73-php-mbstring-7.3.6-1.el7.remi.x86_64
php73-php-pecl-mcrypt-1.0.2-1.el7.remi.x86_64
php73-runtime-2.0-1.el7.remi.x86_64
php73-php-pdo-7.3.6-1.el7.remi.x86_64
php73-php-bcmath-7.3.6-1.el7.remi.x86_64
php73-php-fpm-7.3.6-1.el7.remi.x86_64
php73-php-mysqlnd-7.3.6-1.el7.remi.x86_64
php73-php-snmp-7.3.6-1.el7.remi.x86_64
php73-php-gd-7.3.6-1.el7.remi.x86_64
php73-php-json-7.3.6-1.el7.remi.x86_64
php73-php-soap-7.3.6-1.el7.remi.x86_64
php73-php-recode-7.3.6-1.el7.remi.x86_64
php73-php-pecl-crypto-0.3.1-5.el7.remi.x86_64
php73-php-common-7.3.6-1.el7.remi.x86_64
php73-php-opcache-7.3.6-1.el7.remi.x86_64
php73-php-pecl-geoip-1.1.1-6.el7.remi.x86_64
找到：php73-php-fpm-7.3.6-1.el7.remi.x86_64安装位置
[root@xxx etc]# rpm -ql php73-php-fpm-7.3.6-1.el7.remi.x86_64
/etc/logrotate.d/php73-php-fpm
/etc/opt/remi/php73/php-fpm.conf
/etc/opt/remi/php73/php-fpm.d
/etc/opt/remi/php73/php-fpm.d/www.conf
/etc/opt/remi/php73/sysconfig/php-fpm
/etc/systemd/system/php73-php-fpm.service.d
/opt/remi/php73/root/usr/sbin/php-fpm
/opt/remi/php73/root/usr/share/doc/php73-php-fpm-7.3.6
/opt/remi/php73/root/usr/share/doc/php73-php-fpm-7.3.6/php-fpm.conf.default
/opt/remi/php73/root/usr/share/doc/php73-php-fpm-7.3.6/www.conf.default
/opt/remi/php73/root/usr/share/fpm
/opt/remi/php73/root/usr/share/fpm/status.html
/opt/remi/php73/root/usr/share/licenses/php73-php-fpm-7.3.6
/opt/remi/php73/root/usr/share/licenses/php73-php-fpm-7.3.6/fpm_LICENSE
/opt/remi/php73/root/usr/share/man/man8/php-fpm.8.gz
/usr/lib/systemd/system/php73-php-fpm.service
/var/opt/remi/php73/lib/php/opcache
/var/opt/remi/php73/lib/php/session
/var/opt/remi/php73/lib/php/wsdlcache
/var/opt/remi/php73/log/php-fpm
/var/opt/remi/php73/run/php-fpm
查找php.ini位置：
[root@xxx etc]# find /etc/opt/remi/php73 -name php.ini
/etc/opt/remi/php73/php.ini
编辑/etc/opt/remi/php73/php.ini替换换 ;cgi.fix_pathinfo=1 为 cgi.fix_pathinfo=0 快捷命令： 最好不关闭吧、因为好多框架依赖这个、而且好像高版本php 修复了这个漏洞，
这是因为在 php 配置文件 www.conf 中的 security.limit_extensions 参数，该参数默认值为 .php，也就是说只允许访问 .php 后缀的文件。
具体看这里：https://blog.csdn.net/sun_cainiao/article/details/79601904
sed -i 's/;cgi.fix_pathinfo=1/cgi.fix_pathinfo=0/' /etc/opt/remi/php73/php.ini
重启php73-php-fpm
systemctl restart php73-php-fpm
更多操作：
systemctl restart php73-php-fpm #重启
systemctl start php73-php-fpm #启动
systemctl stop php73-php-fpm #关闭
systemctl status php73-php-fpm #检查状态
查看 PHP
验证一下是否安装成功：
root@mf88.biz-service:~# php73 -v
PHP 7.3.0-1+(cli) (built: Dec 6 2018 20:24:55) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.0-dev, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.3.0-1+ubuntu18.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies
更新 PHP
运行下面的命令系统就会更新所有可以更新的软件包括 PHP
yum update
安装更多组件
上面的一条命令安装 PHP 只是安装了部分 PHP 拓展，更多的软件可见：
# yum search php73
Updating Subscription Management repositories.
Last metadata expiration check: 0:27:54 ago on Wed 15 May 2019 10:39:52 AM EDT.
============================================================================================= Name Exactly Matched: php73 ==============================================================================================
php73.x86_64 : Package that installs PHP 7.3
php73.x86_64 : Package that installs PHP 7.3
============================================================================================ Name & Summary Matched: php73 =============================================================================================
php73-syspaths.x86_64 : System-wide wrappers for the php73 package
php73-syspaths.x86_64 : System-wide wrappers for the php73 package
php73-scldevel.x86_64 : Package shipping development files for php73
php73-scldevel.x86_64 : Package shipping development files for php73
php73-php-zstd-devel.x86_64 : php73-php-zstd developer files (header)
php73-runtime.x86_64 : Package that handles php73 Software Collection.
php73-runtime.x86_64 : Package that handles php73 Software Collection.
php73-runtime.x86_64 : Package that handles php73 Software Collection.
php73-php-pecl-psr-devel.x86_64 : php73-php-pecl-psr developer files (header)
php73-php-pecl-psr-devel.x86_64 : php73-php-pecl-psr developer files (header)
php73-php-pecl-raphf-devel.x86_64 : php73-php-pecl-raphf developer files (header)
php73-php-pecl-raphf-devel.x86_64 : php73-php-pecl-raphf developer files (header)
php73-php-pecl-propro-devel.x86_64 : php73-php-pecl-propro developer files (header)
php73-php-pecl-yaconf-devel.x86_64 : php73-php-pecl-yaconf developer files (header)
php73-php-pecl-propro-devel.x86_64 : php73-php-pecl-propro developer files (header)
php73-php-pecl-yaconf-devel.x86_64 : php73-php-pecl-yaconf developer files (header)
php73-php-pecl-xmldiff-devel.x86_64 : php73-php-pecl-xmldiff developer files (header)
php73-php-pecl-swoole4-devel.x86_64 : php73-php-pecl-swoole4 developer files (header)
php73-php-pecl-xmldiff-devel.x86_64 : php73-php-pecl-xmldiff developer files (header)
php73-php-zephir-parser-devel.x86_64 : php73-php-zephir-parser developer files (headers)
php73-php-zephir-parser-devel.x86_64 : php73-php-zephir-parser developer files (headers)
php73-php-pecl-handlebars-devel.x86_64 : php73-php-pecl-handlebars developer files (header)
================================================================================================= Name Matched: php73 ==================================================================================================
php73-php.x86_64 : PHP scripting language for creating dynamic web sites
php73-php.x86_64 : PHP scripting language for creating dynamic web sites
php73-build.x86_64 : Package shipping basic build configuration
……
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