php5.4系统升级出错的解决办法：1、安装libmcrypt，libmcrypt-devel；2、升级EPEL源；3、重新升级即可。
本文操作环境：CentOS7.3系统、php5.4版、Dell G3电脑。
如何解决php5.4 系统升级出错问题？
CentOS7 PHP5.4 升级 PHP5.6 缺少libmcrypt问题解决办法
系统为CentOS7.3，安装PHP后，版本为5.4，当进行升级5.6时发生错误：报错缺少libmcrypt.so.4()(64bit)库
需要安装libmcrypt，libmcrypt-devel：
yum install libmcrypt libmcrypt-devel
直接输入以上指令，出错！问题为EPEL源未更新到最新版本。
需要升级EPEL源：
立即学习“PHP免费学习笔记（深入）”；
命令：yum -y install epel-release
yum -y install epel-release Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: 100.125.0.40 * extras: 100.125.0.40 * updates: 100.125.0.40 * webtatic: us-east.repo.webtatic.com Resolving Dependencies --> Running transaction check ---> Package epel-release.noarch 0:7-9 will be updated ---> Package epel-release.noarch 0:7-11 will be an update --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================== Package Arch Version Repository Size ======================================================================================================== Updating: epel-release noarch 7-11 extras 15 k Transaction Summary ======================================================================================================== Upgrade 1 Package Total download size: 15 k Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. epel-release-7-11.noarch.rpm | 15 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Updating : epel-release-7-11.noarch 1/2 Cleanup : epel-release-7-9.noarch 2/2 Verifying : epel-release-7-11.noarch 1/2 Verifying : epel-release-7-9.noarch 2/2 Updated: epel-release.noarch 0:7-11 Complete!
从7-9 升级至7-11
EPEL最新是7-12，因此再输入一次上面的指令：
yum -y install epel-release Loaded plugins: fastestmirror, langpacks epel/x86_64/metalink | 8.6 kB 00:00:00 epel | 5.4 kB 00:00:00 (1/3): epel/x86_64/updateinfo | 1.0 MB 00:00:00 (2/3): epel/x86_64/group_gz | 90 kB 00:00:01 (3/3): epel/x86_64/primary_db | 6.9 MB 00:01:00 Loading mirror speeds from cached hostfile * base: 100.125.0.40 * epel: mirrors.aliyun.com * extras: 100.125.0.40 * updates: 100.125.0.40 * webtatic: uk.repo.webtatic.com Resolving Dependencies --> Running transaction check ---> Package epel-release.noarch 0:7-11 will be updated ---> Package epel-release.noarch 0:7-12 will be an update --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================== Package Arch Version Repository Size ======================================================================================================== Updating: epel-release noarch 7-12 epel 15 k Transaction Summary ======================================================================================================== Upgrade 1 Package Total download size: 15 k Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. epel-release-7-12.noarch.rpm | 15 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Updating : epel-release-7-12.noarch 1/2 Cleanup : epel-release-7-11.noarch 2/2 Verifying : epel-release-7-12.noarch 1/2 Verifying : epel-release-7-11.noarch 2/2 Updated: epel-release.noarch 0:7-12
完成升级7-12。
再次安装
libmcrypt，libmcrypt-devel：
yum install libmcrypt libmcrypt-devel
yum install libmcrypt libmcrypt-devel Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: 100.125.0.40 * epel: my.mirrors.thegigabit.com * extras: 100.125.0.40 * updates: 100.125.0.40 * webtatic: uk.repo.webtatic.com Resolving Dependencies --> Running transaction check ---> Package libmcrypt.x86_64 0:2.5.8-13.el7 will be installed ---> Package libmcrypt-devel.x86_64 0:2.5.8-13.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================== Package Arch Version Repository Size ======================================================================================================== Installing: libmcrypt x86_64 2.5.8-13.el7 epel 99 k libmcrypt-devel x86_64 2.5.8-13.el7 epel 13 k Transaction Summary ======================================================================================================== Install 2 Packages Total download size: 112 k Installed size: 302 k Is this ok [y/d/N]: y Downloading packages: (1/2): libmcrypt-2.5.8-13.el7.x86_64.rpm | 99 kB 00:00:00 (2/2): libmcrypt-devel-2.5.8-13.el7.x86_64.rpm | 13 kB 00:00:00 -------------------------------------------------------------------------------------------------------- Total 1.2 MB/s | 112 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : libmcrypt-2.5.8-13.el7.x86_64 1/2 Installing : libmcrypt-devel-2.5.8-13.el7.x86_64 2/2 Verifying : libmcrypt-devel-2.5.8-13.el7.x86_64 1/2 Verifying : libmcrypt-2.5.8-13.el7.x86_64 2/2 Installed: libmcrypt.x86_64 0:2.5.8-13.el7 libmcrypt-devel.x86_64 0:2.5.8-13.el7 Complete!
成功！
最后升级PHP，指令：
yum install -y php56w php56w-opcache php56w-xml php56w-mcrypt php56w-gd php56w-devel php56w-mysql php56w-intl php56w-mbstring
推荐学习：《PHP视频教程》
