一，备份原先的php文件
查看现有php版本：
[root@localhost local]#php-vPHP5.5.38(cli) (built:Oct24 2017 15:58:09)
备份，由于不是覆盖安装，这里也可以不备份，但是，作为日常操作习惯来说，备份还是很有必要的。
[root@localhost ~]# cd /usr/local/[root@localhostlocal]# cp -a php php5538
二，下载解压PHP的最新稳定版7.2.2
[root@localhost ~]# cd soft[root@localhost soft]# wget http://cn2.php.net/distributions/php-7.2.2.tar.bz2[root@localhost soft]# tar xf php-7.2.2.tar.bz2[root@localhost soft]# cd php-7.2.2/
三，查看之前php的configure信息
升级自然要重新安装，那么之前的configure自然要知晓，怎么查看之前的configure信息呢，一般来说有两种方法，第一种，是通过phpinfo()信息：
第二种，通过命令的方式：
[root@localhost ~]# php -i | grep configureConfigure Command =>'./configure''--prefix=/usr/local/php''--with-config-file-path=/usr/local/php/etc''--with-config-file-scan-dir=/usr/local/php/conf.d''--enable-fpm''--with-fpm-user=www''--with-fpm-group=www''--with-mysql=mysqlnd''--with-mysqli=mysqlnd''--with-pdo-mysql=mysqlnd''--with-iconv-dir''--with-freetype-dir=/usr/local/freetype''--with-jpeg-dir''--with-png-dir''--with-zlib''--with-libxml-dir=/usr''--enable-xml''--disable-rpath''--enable-bcmath''--enable-shmop''--enable-sysvsem''--enable-inline-optimization''--with-curl''--enable-mbregex''--enable-mbstring''--with-mcrypt''--enable-ftp''--with-gd''--enable-gd-native-ttf''--with-openssl''--with-mhash''--enable-pcntl''--enable-sockets''--with-xmlrpc''--enable-zip''--enable-soap''--with-gettext''--disable-fileinfo''--enable-opcache''--enable-intl''--with-xsl'
通过sed 将configure命令提取出来：
[root@localhost ~]# php -i | grep configure | sed -e "s/Configure Command => //; s/'//g"./configure --prefix=/usr/local/php --with-config-file-path=/usr/local/php/etc --with-config-file-scan-dir=/usr/local/php/conf.d --enable-fpm --with-fpm-user=www --with-fpm-group=www --with-mysql=mysqlnd --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd --with-iconv-dir --with-freetype-dir=/usr/local/freetype --with-jpeg-dir --with-png-dir --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --enable-mbregex --enable-mbstring --with-mcrypt --enable-ftp --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --with-gettext --disable-fileinfo --enable-opcache --enable-intl --with-xsl
四，开始编译安装php7.2.2
[root@localhost php-7.2.2]# ./configure --prefix=/usr/local/php7 \--with-config-file-path=/usr/local/php7/etc \--with-config-file-scan-dir=/usr/local/php7/conf.d \--enable-fpm \--with-fpm-user=www \--with-fpm-group=www \--with-mysql=mysqlnd \--with-mysqli=mysqlnd \--with-pdo-mysql=mysqlnd \--with-iconv-dir \--with-freetype-dir=/usr/local/freetype \--with-jpeg-dir \--with-png-dir \--with-zlib \--with-libxml-dir=/usr \--enable-xml \--disable-rpath \--enable-bcmath \--enable-shmop \--enable-sysvsem \--enable-inline-optimization \--with-curl \--enable-mbregex \--enable-mbstring \--with-mcrypt \--enable-ftp \--with-gd \--enable-gd-native-ttf \--with-openssl \--with-mhash \--enable-pcntl \--enable-sockets \--with-xmlrpc \--enable-zip \--enable-soap \--with-gettext \--disable-fileinfo \--enable-opcache \--enable-intl --with-xsl
configure的过程中会报一个警告信息：
configure: WARNING: unrecognized options: --with-mysql, --with-mcrypt, --enable-gd-native-ttf
表示php7.2.2不支持以上三个选项，删掉即可。
下面开始编译：
[root@localhost php-7.2.2]# make && make install
这个过程非常耗时，需要耐心等待。
这里会报一个错误：
/root/soft/php-7.2.2/ext/xmlrpc/libxmlrpc/encodings.c:65:undefinedreference to `libiconv_open'
/root/soft/php-7.2.2/ext/xmlrpc/libxmlrpc/encodings.c:73: undefined reference to `libiconv'
/root/soft/php-7.2.2/ext/xmlrpc/libxmlrpc/encodings.c:93: undefined reference to `libiconv_close'/root/soft/php-7.2.2/ext/xmlrpc/libxmlrpc/encodings.c:93:undefinedreference to `libiconv_close'collect2: error: ld returned1exit statusmake: *** [sapi/cli/php]Error1
报错提示缺少libiconv这个库，缺啥就装啥。
wget http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.13.1.tar.gztar xf libiconv-1.13.1.tar.gzcdlibiconv-1.13.1/./configure --prefix=/usr/local/libiconvmake && make install
安装完后需要在configure时加入--with-iconv=/usr/local/libiconv参数，然后再次编译就不会报错了
五，复制修改配置文件，启动php-fpm
[root@localhostlocal]# cp php/etc/php.ini php7/etc/[root@localhostlocal]# cp php/etc/php-fpm.conf php7/etc/[root@localhost ~]# service php-fpm stop Gracefully shutting down php-fpm . done#关闭原来的php-fpm
修改php-fpm.conf
[global]pid =/usr/local/php7/var/run/php-fpm.piderror_log =/usr/local/php7/var/log/php-fpm.log
删除/usr/local/php目录
[root@localhostlocal]# rm -rf php
创建指向php7的软链接
[root@localhostlocal]# ln -sv php7 php
启动php-fpm
[root@localhost etc]# service php-fpm start Starting php-fpm [23-Feb-201820:48:41]NOTICE:PHPmessage:PHPWarning:PHPStartup:Unable to load dynamic library'/usr/local/php/lib/php/extensions/no-debug-non-zts-20121212/redis.so'(tried:/usr/local/php/lib/php/extensions/no-debug-non-zts-20121212/redis.so (/usr/local/php/lib/php/extensions/no-debug-non-zts-20121212/redis.so:undefinedsymbol:zval_used_for_init),/usr/local/php7/lib/php/extensions/no-debug-non-zts-20170718//usr/local/php/lib/php/extensions/no-debug-non-zts-20121212/redis.so.so (/usr/local/php7/lib/php/extensions/no-debug-non-zts-20170718//usr/local/php/lib/php/extensions/no-debug-non-zts-20121212/redis.so.so:cannot open shared objectfile:No such fileordirectory))inUnknown on line0[23-Feb-201820:48:41]ERROR:An another FPM instance seems to already listen on /tmp/php-cgi.sock[23-Feb-201820:48:41]ERROR:FPM initialization failed failed
报错了，提示redis扩展没有装。
六，安装redis扩展
下载地址
https://github.com/phpredis/phpredis/archive/php7.zip
unzip php7.zipcdsoft/phpredis-php7//usr/local/php7/bin/phpize./configure --with-php-config=/usr/local/php7/bin/php-configmake && make install
在php.ini中添加如下一行
extension=redis.so
重启php-fpm
[root@localhost etc]# service php-fpm restart Gracefully shutting down php-fpm .doneStarting php-fpmdone
查看php版本
[root@localhost etc]#php-vPHP7.2.2(cli) (built:Feb23 2018 19:25:46)(NTS)Copyright(c) 1997-2018ThePHPGroupZendEnginev3.2.0,Copyright(c) 1998-2018ZendTechnologies
查看phpinfo()
至此，php升级完成。
第二种，通过命令的方式：
[root@localhost ~]# php -i | grep configure
通过sed 将configure命令提取出来：
[root@localhost ~]# php -i | grep configure | sed -e "s/Configure Command => //; s/'//g"
php -i | grep configure | sed -e "s/Configure Command => //; s/'//g"
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