CentOS6 不支持 php7.4版本的安装了（可能是我技术不行）
php7.3.x编译安装。
// 后面会提示 system libzip must be upgraded to version >= 0.11 所以提前卸载，自己编译。
yum -y remove libzip-devel libzip
// 就下载这个版本，别下载太高的，centos6上编译不过
wget https://nih.at/libzip/libzip-1.2.0.tar.gz
tar -zxvf libzip-1.2.0.tar.gz
cd libzip-1.2.0
./configure
make -j
make install
--------------------------------------------------- 好像只有centos6需要以下操作------------------------------------------------------------------------------------------------
yum -y install bzip2 bzip2-devel libxml2-devel curl-devel libjpeg-devel libpng libpng-devel freetype-devel gmp-devel readline readline-devel libxslt libxslt-devel
vim /etc/ld.so.conf
#添加如下几行
/usr/local/lib64
/usr/local/lib
/usr/lib
/usr/lib64
#保存退出
ldconfig -v
# 使之生效
cp /usr/local/lib/libzip/include/zipconf.h /usr/local/include/zipconf.h
-------------------------------------------------------------------------------------------------------------------------------------------------------
// 下载PHP
wget https://www.php.net/distributions/php-7.3.24.tar.gz
tar -zxvf php-7.3.24.tar.gz
cd php-7.3.24.tar.gz
// 编译
./configure
--prefix=/usr/local/php73
--with-config-file-path=/usr/local/php73/etc
--enable-fpm
--with-fpm-user=nginx
--with-fpm-group=nginx
--enable-inline-optimization
--disable-debug
--disable-rpath
--enable-shared
--enable-soap
--with-libxml-dir
--with-xmlrpc
--with-openssl
--with-mhash
--with-pcre-regex
--with-sqlite3
--with-zlib
--enable-bcmath
--with-iconv
--with-bz2
--enable-calendar
--with-curl
--with-cdb
--enable-dom
--enable-exif
--enable-fileinfo
--enable-filter
--with-pcre-dir
--enable-ftp
--with-gd
--with-openssl-dir
--with-jpeg-dir
--with-png-dir
--with-zlib-dir
--with-freetype-dir
--enable-gd-jis-conv
--with-gettext
--with-gmp
--with-mhash
--enable-json
--enable-mbstring
--enable-mbregex
--enable-mbregex-backtrack
--with-onig
--enable-pdo
--with-mysqli=mysqlnd
--with-pdo-mysql=mysqlnd
--with-zlib-dir
--with-pdo-sqlite
--with-readline
--enable-session
--enable-shmop
--enable-simplexml
--enable-sockets
--enable-sysvmsg
--enable-sysvsem
--enable-sysvshm
--enable-wddx
--with-libxml-dir
--with-xsl
--enable-zip
--enable-mysqlnd-compression-support
--with-pear
--enable-opcache
make -j
make install
// 配置文件修改：
cp php.ini-production /usr/local/php73/etc/php.ini
cp sapi/fpm/init.d.php-fpm /etc/init.d/php73-fpm
cp /usr/local/php73/etc/php-fpm.conf.default /usr/local/php73/etc/php-fpm.conf
cp /usr/local/php73/etc/php-fpm.d/www.conf.default /usr/local/php73/etc/php-fpm.d/www.conf
#php-fpm 端口可在 www.conf 里修改
chmod +x /etc/init.d/php73-fpm
/etc/init.d/php73-fpm start
# php73加入环境变量
ln -s /usr/local/php73/bin/php /usr/local/bin/php73
#开机自启动
vim /etc/rc.local
/etc/init.d/php73-fpm start
# 修改不显示X-Power-By
vim /usr/local/php73/etc/php.ini
找到 expose_php
把 on 改为 off
/etc/init.d/php73-fpm restart