需求
應(yīng)開發(fā)的需求，線上環(huán)境，php-libxml版本升級到2.8以上。
軟件版本說明
當前系統(tǒng)，各軟件版本：
php 5.6.15
libxml 2.7.6
glibc 2.12
zlib 1.2.3
xz-libs 4.999.9
升級步驟
1、安裝工具集
yum groupinstall -y 'development tools'
yum install kernel-headers -y
2、解決安裝libxml2-1.9.0版本時，遇到的依賴關(guān)系
1）升級glibc版本 （ 版本 > glibc-2.12 ）
centos6系統(tǒng)，官方支持升級的最高版本是glibc-2.12（即yum升級支持的最高版本）。
wget http://ftp.redsleeve.org/pub/steam/glibc-2.15-60.el6.x86_64.rpm
wget http://ftp.redsleeve.org/pub/steam/glibc-devel-2.15-60.el6.x86_64.rpm
wget http://ftp.redsleeve.org/pub/steam/glibc-common-2.15-60.el6.x86_64.rpm
wget http://ftp.redsleeve.org/pub/steam/glibc-headers-2.15-60.el6.x86_64.rpm
rpm -Uvh glibc-2.15-60.el6.x86_64.rpm glibc-devel-2.15-60.el6.x86_64.rpm glibc-common-2.15-60.el6.x86_64.rpm glibc-headers-2.15-60.el6.x86_64.rpm
查看當前系統(tǒng)安裝了glibc哪些包，以及最高支持版本：
# rpm -qa |grep glibc
glibc-2.15-60.el6.x86_64
glibc-common-2.15-60.el6.x86_64
glibc-devel-2.15-60.el6.x86_64
glibc-headers-2.15-60.el6.x86_64
# strings /lib64/libc.so.6 | grep GLIBC
GLIBC_2.2.5
GLIBC_2.2.6
GLIBC_2.3
GLIBC_2.3.2
GLIBC_2.3.3
GLIBC_2.3.4
GLIBC_2.4
GLIBC_2.5
GLIBC_2.6
GLIBC_2.7
GLIBC_2.8
GLIBC_2.9
GLIBC_2.10
GLIBC_2.11
GLIBC_2.12
GLIBC_2.13
GLIBC_2.14
GLIBC_2.15
GLIBC_PRIVATE
2）升級zlib版本 ( 版本 >= zlib-1.2.5 )
centos6系統(tǒng)，官方支持升級的最高版本是zlib-1.2.5。（即yum升級支持的最高版本）
wget http://ftp5.gwdg.de/pub/opensuse/repositories/home:/codice:/mono-redhat/CentOS_CentOS-6/x86_64/zlib-1.2.5-codice.4.1.x86_64.rpm
wget http://ftp5.gwdg.de/pub/opensuse/repositories/home:/codice:/mono-redhat/CentOS_CentOS-6/x86_64/zlib-devel-1.2.5-codice.4.1.x86_64.rpm
wget http://ftp5.gwdg.de/pub/opensuse/repositories/home:/codice:/mono-redhat/CentOS_CentOS-6/x86_64/zlib-static-1.2.5-codice.4.1.x86_64.rpm
rpm -Uvh zlib-1.2.5-codice.4.1.x86_64.rpm zlib-devel-1.2.5-codice.4.1.x86_64.rpm zlib-static-1.2.5-codice.4.1.x86_64.rpm
3）python2.7支持
centos6.5中，官方默認的Python版本為2.6。要裝2.7版本，需要修改yum源。
yum install epel-release -y
wget https://centos6.iuscommunity.org/ius-release.rpm
rpm -ivh ius-release.rpm
yum clean all
yum install python27 -y
4）升級xz-libs版本 ( 版本 > xz-libs-4.9 )
centos6.5，官方y(tǒng)um升級的最高版本是4.999.9
wget http://ftp.redsleeve.org/pub/steam/xz-libs-5.0.5-1.el6.x86_64.rpm
wget http://ftp.redsleeve.org/pub/steam/xz-devel-5.0.5-1.el6.x86_64.rpm
wget http://ftp.redsleeve.org/pub/steam/xz-5.0.5-1.el6.x86_64.rpm
wget http://ftp.redsleeve.org/pub/steam/xz-lzma-compat-5.0.5-1.el6.x86_64.rpm
wget http://ftp.redsleeve.org/pub/steam/xz-compat-libs-5.0.5-1.el6.x86_64.rpm
rpm -Uvh xz-libs-5.0.5-1.el6.x86_64.rpm xz-devel-5.0.5-1.el6.x86_64.rpm xz-5.0.5-1.el6.x86_64.rpm xz-lzma-compat-5.0.5-1.el6.x86_64.rpm xz-compat-libs-5.0.5-1.el6.x86_64.rpm
3、升級libxml2
wget http://xmlsoft.org/sources/libxml2-devel-2.9.0-0rc0.x86_64.rpm
wget http://xmlsoft.org/sources/libxml2-2.9.0-0rc0.x86_64.rpm
wget http://xmlsoft.org/sources/libxml2-python-2.9.0-0rc0.x86_64.rpm
rpm -Uvh libxml2-2.9.0-0rc0.x86_64.rpm libxml2-devel-2.9.0-0rc0.x86_64.rpm libxml2-python-2.9.0-0rc0.x86_64.rpm
4、重新編譯php
需要重新編譯php，使升級的php-libxml生效。
進入php5.6.15的源碼目錄，重新編譯php：
# cd php-5.6.15
# ./configure --prefix=/usr/local/php --with-config-file-path=/usr/local/php/etc --enable-fpm --enable-bcmath=shared --with-pdo_sqlite --with-gettext=shared --with-iconv --enable-ftp=shared --with-sqlite --with-sqlite3 --enable-mbstring=shared --enable-sockets=shared --enable-zip --enable-soap=shared --with-openssl --with-zlib --with-curl=shared --with-gd=shared --with-jpeg-dir --with-png-dir --with-freetype-dir --with-mcrypt=shared --with-mhash=shared --enable-opcache --with-mysql=mysqlnd --with-mysqli=shared,mysqlnd --with-pdo-mysql=shared,mysqlnd --without-pear --with-libdir=lib64 --disable-fileinfo
# make
替換生成的php、php-cgi程序文件:
# /etc/init.d/php-fpm stop
# mv /usr/local/php/bin/php /usr/local/php/bin/php.bak
# mv /usr/local/php/bin/php-cgi /usr/local/php/bin/php-cgi.bak
# cp -a sapi/cli/php /usr/local/php/bin/
# cp -a sapi/cgi/php-cgi /usr/local/php/bin/
# /etc/init.d/php-fpm start
查看php-libxml版本升級是否生效：
# /usr/local/php/bin/php -i|grep libxml
libxml Version => 2.9.0
libxml
libxml2 Version => 2.9.0
后續(xù)補充
開啟phpinfo訪問，發(fā)現(xiàn)libxml版本仍是2.7.6。上述替換php、php-cgi程序的方法，是不能使得php-libxml版本升級生效的。
需要重新編譯安裝php（不同安裝目錄），才會生效。
